r"""An ISO8583 spec is a Python dictionary. It describes how each field
needs to be encoded and decoded.

Fields
------
Supported fields:

- **h** - Message Header. If a specification does not have a header then
  set **max_len** to ``0`` to disable it.
- **t** - Message Type Identifier
- **p** - Primary Bitmap
- **1** - Secondary Bitmap
- **2** .. **128** - Regular fields

Mandatory Field Properties
--------------------------
Each field defines these properties:

- **data_enc** - field data encoding type. Set to:

  - ``b`` for binary or Binary-Coded Decimal (BCD) data. For example,
    ``ABCD`` hex string is encoded as ``\xAB\xCD`` 2-byte value. Or ``1234``
    numeric string is encoded as ``\x12\x34`` 2-byte BCD value.
  - Or any valid Python encoding. For example, ``ascii`` or
    ``latin-1`` for ASCII data and ``cp500`` or similar for EBCDIC data.
    For a list of built-in encodings, see Python standard encodings:
    https://docs.python.org/3/library/codecs.html#standard-encodings

- **len_enc** - field length encoding type. This is needed for some fields,
  such as ICC data, that could have binary data but ASCII length.
  This parameter does not affect fixed-length fields. Set to:

  - ``bcd`` for Binary-Coded Decimal (BCD) length. For example,
    ``1234`` field length is encoded as ``\x12\x34`` 2-byte BCD value.
  - Or any valid Python encoding. For example, ``ascii`` or
    ``latin-1`` for ASCII length and ``cp500`` or similar for EBCDIC length.
    For a list of built-in encodings, see Python standard encodings:
    https://docs.python.org/3/library/codecs.html#standard-encodings

- **len_type** - field length type: fixed, LVAR, LLVAR, etc.
  Expressed as a number of bytes in field length. For example,
  ASCII LLVAR length takes up 2 bytes (``b'00' - b'99'``).
  BCD LLVAR length can take up only 1 byte (``b'\x00' - b'\x99'``).
  Therefore, **len_type** depends on the type of **len_enc** being used.
  BCD **len_enc** can fit higher length ranges in fewer bytes.

  +--------------+---------------------------------------+
  |              |              **len_enc**              |
  |              +----------------+----------------------+
  | **len_type** | ASCII / EBCDIC | Binary-Coded Decimal |
  +--------------+----------------+----------------------+
  |  Fixed       |          ``0`` |                ``0`` |
  +--------------+----------------+----------------------+
  |  LVAR        |          ``1`` |                ``1`` |
  +--------------+----------------+----------------------+
  |  LLVAR       |          ``2`` |                ``1`` |
  +--------------+----------------+----------------------+
  |  LLLVAR      |          ``3`` |                ``2`` |
  +--------------+----------------+----------------------+
  |  LLLLVAR     |          ``4`` |                ``2`` |
  +--------------+----------------+----------------------+

- **max_len** - field maximum length in bytes or nibbles. For fixed fields
  **max_len** defines the length of the field.

- **desc** - field description that's printed in a pretty format.
  **desc** plays no role in encoding or decoding data. It's safe to omit it
  from the specifications. However, if omitted :func:`iso8583.pp` may or may
  not work as expected.

Optional Field Properties
-------------------------
Each field may define these additional properties as needed:

- **len_count** - specifies if field length is measured
  in bytes or nibbles (half bytes). This parameter affects **max_len**.

  - Use ``bytes`` (default) to measure field length in bytes.
  - Use ``nibbles`` to measure field length if nibbles (half bytes).

- **left_pad** - specifies pad character to be added/removed on the left side
  of an odd binary or BCD field without this character being included into
  field length. Valid pad character is ``0-9`` for BCD fields and ``0-F``
  for binary fields.

  This option is used only when **data_enc** is set to ``b`` (binary/BCD)
  and **len_count** is set to ``nibbles``. This option is meant for
  specifications that require odd length binary or BCD data.

- **right_pad** - same as **left_pad** but it pads on the right side.
  Specify either **left_pad** or **right_pad**. If both are specified at
  the same time then **left_pad** takes precedence.

Sample Field Specifications
---------------------------
Binary primary bitmap.
Length encoding makes no difference, since the field has no length::

    specification["p"] = {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Binary bitmap, e.g. \x12\x34\x56\x78\x90\xAB\xCD\xEF"
    }

Hex string primary bitmap.
Length encoding makes no difference, since the field has no length::

    specification["p"] = {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Hex string bitmap, e.g 1234567890ABCDEF"
    }

Field 2, a 10-byte binary or BCD fixed length field.
Length encoding makes no difference, since the field has no length::

    specification["2"] = {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Binary or BCD fixed field"
    }

Field 3, an ASCII LLVAR field of maximum 20 bytes::

    specification["3"] = {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 20,
        "desc": "ASCII LLVAR field"
    }

Field 4, an EBCDIC LLLVAR field of maximum 150 bytes::

    specification["4"] = {
        "data_enc": "cp500",
        "len_enc": "cp500",
        "len_type": 3,
        "max_len": 150,
        "desc": "EBCDIC LLLVAR field"
    }

Field 5, a binary or BCD LLVAR field measured in nibbles and left-padded with 0.
The field is maximum 20 nibbles::

    specification["5"] = {
        "data_enc": "b",
        "len_enc": "bcd",
        "len_type": 1,
        "len_count": "nibbles",
        "left_pad": "0",
        "max_len": 20,
        "desc": "Binary or BCD LLVAR field measured in nibbles, e.g. \x03\x01\x11"
    }

Field 6, a 3-nibble binary or BCD fixed field right-padded with 0.
Length encoding makes no difference, since the field has no length::

    specification["6"] = {
        "data_enc": "b",
        "len_enc": "bcd",
        "len_type": 0,
        "len_count": "nibbles",
        "right_pad": "0",
        "max_len": 3,
        "desc": "Binary or BCD fixed field measured in nibbles, e.g. \x11\x10"
    }

Sample Message Specifications
-----------------------------

ASCII/Binary
~~~~~~~~~~~~

Bitmaps, MACs, PIN, and ICC data are in binary::

    default = {
    "h":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 0,   "desc": "Message Header"},
    "t":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Message Type"},
    "p":   {"data_enc": "b",     "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Bitmap, Primary"},
    "1":   {"data_enc": "b",     "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Bitmap, Secondary"},
    "2":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 19,  "desc": "Primary Account Number (PAN)"},
    "3":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "Processing Code"},
    "4":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Amount, Transaction"},
    "5":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Amount, Settlement"},
    "6":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Amount, Cardholder Billing"},
    "7":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Transmission Date and Time"},
    "8":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Amount, Cardholder Billing Fee"},
    "9":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Conversion Rate, Settlement"},
    "10":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Conversion Rate, Cardholder Billing"},
    "11":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "System Trace Audit Number"},
    "12":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "Time, Local Transaction"},
    "13":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Local Transaction"},
    "14":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Expiration"},
    "15":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Settlement"},
    "16":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Conversion"},
    "17":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Capture"},
    "18":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Merchant Type"},
    "19":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Acquiring Institution Country Code"},
    "20":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "PAN Country Code"},
    "21":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Forwarding Institution Country Code"},
    "22":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Point-of-Service Entry Mode"},
    "23":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "PAN Sequence Number"},
    "24":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Network International ID (NII)"},
    "25":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "Point-of-Service Condition Code"},
    "26":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "Point-of-Service Capture Code"},
    "27":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 1,   "desc": "Authorizing ID Response Length"},
    "28":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 9,   "desc": "Amount, Transaction Fee"},
    "29":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 9,   "desc": "Amount, Settlement Fee"},
    "30":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 9,   "desc": "Amount, Transaction Processing Fee"},
    "31":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 9,   "desc": "Amount, Settlement Processing Fee"},
    "32":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 11,  "desc": "Acquiring Institution ID Code"},
    "33":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 11,  "desc": "Forwarding Institution ID Code"},
    "34":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 28,  "desc": "Primary Account Number, Extended"},
    "35":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 37,  "desc": "Track 2 Data"},
    "36":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 104, "desc": "Track 3 Data"},
    "37":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Retrieval Reference Number"},
    "38":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "Authorization ID Response"},
    "39":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "Response Code"},
    "40":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Service Restriction Code"},
    "41":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Card Acceptor Terminal ID"},
    "42":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 15,  "desc": "Card Acceptor ID Code"},
    "43":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 40,  "desc": "Card Acceptor Name/Location"},
    "44":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 25,  "desc": "Additional Response Data"},
    "45":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 76,  "desc": "Track 1 Data"},
    "46":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Additional Data - ISO"},
    "47":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Additional Data - National"},
    "48":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Additional Data - Private"},
    "49":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Currency Code, Transaction"},
    "50":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Currency Code, Settlement"},
    "51":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Currency Code, Cardholder Billing"},
    "52":  {"data_enc": "b",     "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "PIN"},
    "53":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Security-Related Control Information"},
    "54":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 240, "desc": "Additional Amounts"},
    "55":  {"data_enc": "b",     "len_enc": "ascii", "len_type": 3, "max_len": 255, "desc": "ICC data"},
    "56":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved ISO"},
    "57":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved National"},
    "58":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved National"},
    "59":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved National"},
    "60":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved National"},
    "61":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved Private"},
    "62":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved Private"},
    "63":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved Private"},
    "64":  {"data_enc": "b",     "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "MAC"},
    "65":  {"data_enc": "b",     "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Bitmap, Extended"},
    "66":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 1,   "desc": "Settlement Code"},
    "67":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "Extended Payment Code"},
    "68":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Receiving Institution Country Code"},
    "69":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Settlement Institution Country Code"},
    "70":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Network Management Information Code"},
    "71":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Message Number"},
    "72":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Message Number, Last"},
    "73":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "Date, Action"},
    "74":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Credits, Number"},
    "75":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Credits, Reversal Number"},
    "76":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Debits, Number"},
    "77":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Debits, Reversal Number"},
    "78":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Transfer, Number"},
    "79":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Transfer, Reversal Number"},
    "80":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Inquiries, Number"},
    "81":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Authorizations, Number"},
    "82":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Credits, Processing Fee Amount"},
    "83":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Credits, Transaction Fee Amount"},
    "84":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Debits, Processing Fee Amount"},
    "85":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Debits, Transaction Fee Amount"},
    "86":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Credits, Amount"},
    "87":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Credits, Reversal Amount"},
    "88":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Debits, Amount"},
    "89":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Debits, Reversal Amount"},
    "90":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 42,  "desc": "Original Data Elements"},
    "91":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 1,   "desc": "File Update Code"},
    "92":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "File Security Code"},
    "93":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 5,   "desc": "Response Indicator"},
    "94":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 7,   "desc": "Service Indicator"},
    "95":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 42,  "desc": "Replacement Amounts"},
    "96":  {"data_enc": "b",     "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Message Security Code"},
    "97":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 17,  "desc": "Amount, Net Settlement"},
    "98":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 25,  "desc": "Payee"},
    "99":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 11,  "desc": "Settlement Institution ID Code"},
    "100": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 11,  "desc": "Receiving Institution ID Code"},
    "101": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 17,  "desc": "File Name"},
    "102": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 28,  "desc": "Account ID 1"},
    "103": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 28,  "desc": "Account ID 2"},
    "104": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 100, "desc": "Transaction Description"},
    "105": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "106": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "107": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "108": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "109": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "110": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "111": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "112": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "113": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "114": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "115": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "116": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "117": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "118": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "119": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "120": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "121": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "122": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "123": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "124": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "125": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "126": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "127": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "128": {"data_enc": "b",     "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "MAC"}
    }

ASCII
~~~~~

All fields are in ASCII::

    default_ascii = {
    "h":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 0,   "desc": "Message Header"},
    "t":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Message Type"},
    "p":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Bitmap, Primary"},
    "1":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Bitmap, Secondary"},
    "2":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 19,  "desc": "Primary Account Number (PAN)"},
    "3":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "Processing Code"},
    "4":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Amount, Transaction"},
    "5":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Amount, Settlement"},
    "6":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Amount, Cardholder Billing"},
    "7":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Transmission Date and Time"},
    "8":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Amount, Cardholder Billing Fee"},
    "9":   {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Conversion Rate, Settlement"},
    "10":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Conversion Rate, Cardholder Billing"},
    "11":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "System Trace Audit Number"},
    "12":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "Time, Local Transaction"},
    "13":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Local Transaction"},
    "14":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Expiration"},
    "15":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Settlement"},
    "16":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Conversion"},
    "17":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Date, Capture"},
    "18":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Merchant Type"},
    "19":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Acquiring Institution Country Code"},
    "20":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "PAN Country Code"},
    "21":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Forwarding Institution Country Code"},
    "22":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Point-of-Service Entry Mode"},
    "23":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "PAN Sequence Number"},
    "24":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Network International ID (NII)"},
    "25":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "Point-of-Service Condition Code"},
    "26":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "Point-of-Service Capture Code"},
    "27":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 1,   "desc": "Authorizing ID Response Length"},
    "28":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 9,   "desc": "Amount, Transaction Fee"},
    "29":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 9,   "desc": "Amount, Settlement Fee"},
    "30":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 9,   "desc": "Amount, Transaction Processing Fee"},
    "31":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 9,   "desc": "Amount, Settlement Processing Fee"},
    "32":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 11,  "desc": "Acquiring Institution ID Code"},
    "33":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 11,  "desc": "Forwarding Institution ID Code"},
    "34":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 28,  "desc": "Primary Account Number, Extended"},
    "35":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 37,  "desc": "Track 2 Data"},
    "36":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 104, "desc": "Track 3 Data"},
    "37":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Retrieval Reference Number"},
    "38":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "Authorization ID Response"},
    "39":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "Response Code"},
    "40":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Service Restriction Code"},
    "41":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 8,   "desc": "Card Acceptor Terminal ID"},
    "42":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 15,  "desc": "Card Acceptor ID Code"},
    "43":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 40,  "desc": "Card Acceptor Name/Location"},
    "44":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 25,  "desc": "Additional Response Data"},
    "45":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 76,  "desc": "Track 1 Data"},
    "46":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Additional Data - ISO"},
    "47":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Additional Data - National"},
    "48":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Additional Data - Private"},
    "49":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Currency Code, Transaction"},
    "50":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Currency Code, Settlement"},
    "51":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Currency Code, Cardholder Billing"},
    "52":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "PIN"},
    "53":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Security-Related Control Information"},
    "54":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 240, "desc": "Additional Amounts"},
    "55":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 510, "desc": "ICC data"},
    "56":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved ISO"},
    "57":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved National"},
    "58":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved National"},
    "59":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved National"},
    "60":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved National"},
    "61":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved Private"},
    "62":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved Private"},
    "63":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved Private"},
    "64":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "MAC"},
    "65":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Bitmap, Extended"},
    "66":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 1,   "desc": "Settlement Code"},
    "67":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "Extended Payment Code"},
    "68":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Receiving Institution Country Code"},
    "69":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Settlement Institution Country Code"},
    "70":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 3,   "desc": "Network Management Information Code"},
    "71":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Message Number"},
    "72":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 4,   "desc": "Message Number, Last"},
    "73":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 6,   "desc": "Date, Action"},
    "74":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Credits, Number"},
    "75":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Credits, Reversal Number"},
    "76":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Debits, Number"},
    "77":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Debits, Reversal Number"},
    "78":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Transfer, Number"},
    "79":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Transfer, Reversal Number"},
    "80":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Inquiries, Number"},
    "81":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 10,  "desc": "Authorizations, Number"},
    "82":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Credits, Processing Fee Amount"},
    "83":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Credits, Transaction Fee Amount"},
    "84":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Debits, Processing Fee Amount"},
    "85":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 12,  "desc": "Debits, Transaction Fee Amount"},
    "86":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Credits, Amount"},
    "87":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Credits, Reversal Amount"},
    "88":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Debits, Amount"},
    "89":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Debits, Reversal Amount"},
    "90":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 42,  "desc": "Original Data Elements"},
    "91":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 1,   "desc": "File Update Code"},
    "92":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 2,   "desc": "File Security Code"},
    "93":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 5,   "desc": "Response Indicator"},
    "94":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 7,   "desc": "Service Indicator"},
    "95":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 42,  "desc": "Replacement Amounts"},
    "96":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "Message Security Code"},
    "97":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 17,  "desc": "Amount, Net Settlement"},
    "98":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 25,  "desc": "Payee"},
    "99":  {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 11,  "desc": "Settlement Institution ID Code"},
    "100": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 11,  "desc": "Receiving Institution ID Code"},
    "101": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 17,  "desc": "File Name"},
    "102": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 28,  "desc": "Account ID 1"},
    "103": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 2, "max_len": 28,  "desc": "Account ID 2"},
    "104": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 100, "desc": "Transaction Description"},
    "105": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "106": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "107": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "108": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "109": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "110": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "111": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for ISO Use"},
    "112": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "113": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "114": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "115": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "116": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "117": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "118": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "119": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for National Use"},
    "120": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "121": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "122": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "123": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "124": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "125": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "126": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "127": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 3, "max_len": 999, "desc": "Reserved for Private Use"},
    "128": {"data_enc": "ascii", "len_enc": "ascii", "len_type": 0, "max_len": 16,  "desc": "MAC"}
    }

"""

# ASCII/Binary
# Bitmaps, MACs, PIN, and ICC data are in binary
default = {
    "h": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 0,
        "desc": "Message Header",
    },
    "t": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Message Type",
    },
    "p": {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Bitmap, Primary",
    },
    "1": {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Bitmap, Secondary",
    },
    "2": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 19,
        "desc": "Primary Account Number (PAN)",
    },
    "3": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "Processing Code",
    },
    "4": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Amount, Transaction",
    },
    "5": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Amount, Settlement",
    },
    "6": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Amount, Cardholder Billing",
    },
    "7": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Transmission Date and Time",
    },
    "8": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Amount, Cardholder Billing Fee",
    },
    "9": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Conversion Rate, Settlement",
    },
    "10": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Conversion Rate, Cardholder Billing",
    },
    "11": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "System Trace Audit Number",
    },
    "12": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "Time, Local Transaction",
    },
    "13": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Local Transaction",
    },
    "14": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Expiration",
    },
    "15": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Settlement",
    },
    "16": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Conversion",
    },
    "17": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Capture",
    },
    "18": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Merchant Type",
    },
    "19": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Acquiring Institution Country Code",
    },
    "20": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "PAN Country Code",
    },
    "21": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Forwarding Institution Country Code",
    },
    "22": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Point-of-Service Entry Mode",
    },
    "23": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "PAN Sequence Number",
    },
    "24": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Network International ID (NII)",
    },
    "25": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "Point-of-Service Condition Code",
    },
    "26": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "Point-of-Service Capture Code",
    },
    "27": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 1,
        "desc": "Authorizing ID Response Length",
    },
    "28": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 9,
        "desc": "Amount, Transaction Fee",
    },
    "29": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 9,
        "desc": "Amount, Settlement Fee",
    },
    "30": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 9,
        "desc": "Amount, Transaction Processing Fee",
    },
    "31": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 9,
        "desc": "Amount, Settlement Processing Fee",
    },
    "32": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 11,
        "desc": "Acquiring Institution ID Code",
    },
    "33": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 11,
        "desc": "Forwarding Institution ID Code",
    },
    "34": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 28,
        "desc": "Primary Account Number, Extended",
    },
    "35": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 37,
        "desc": "Track 2 Data",
    },
    "36": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 104,
        "desc": "Track 3 Data",
    },
    "37": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Retrieval Reference Number",
    },
    "38": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "Authorization ID Response",
    },
    "39": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "Response Code",
    },
    "40": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Service Restriction Code",
    },
    "41": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Card Acceptor Terminal ID",
    },
    "42": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 15,
        "desc": "Card Acceptor ID Code",
    },
    "43": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 40,
        "desc": "Card Acceptor Name/Location",
    },
    "44": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 25,
        "desc": "Additional Response Data",
    },
    "45": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 76,
        "desc": "Track 1 Data",
    },
    "46": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Additional Data - ISO",
    },
    "47": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Additional Data - National",
    },
    "48": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Additional Data - Private",
    },
    "49": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Currency Code, Transaction",
    },
    "50": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Currency Code, Settlement",
    },
    "51": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Currency Code, Cardholder Billing",
    },
    "52": {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "PIN",
    },
    "53": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Security-Related Control Information",
    },
    "54": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 240,
        "desc": "Additional Amounts",
    },
    "55": {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 255,
        "desc": "ICC data",
    },
    "56": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved ISO",
    },
    "57": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved National",
    },
    "58": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved National",
    },
    "59": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved National",
    },
    "60": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved National",
    },
    "61": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved Private",
    },
    "62": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved Private",
    },
    "63": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved Private",
    },
    "64": {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "MAC",
    },
    "65": {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Bitmap, Extended",
    },
    "66": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 1,
        "desc": "Settlement Code",
    },
    "67": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "Extended Payment Code",
    },
    "68": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Receiving Institution Country Code",
    },
    "69": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Settlement Institution Country Code",
    },
    "70": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Network Management Information Code",
    },
    "71": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Message Number",
    },
    "72": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Message Number, Last",
    },
    "73": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "Date, Action",
    },
    "74": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Credits, Number",
    },
    "75": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Credits, Reversal Number",
    },
    "76": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Debits, Number",
    },
    "77": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Debits, Reversal Number",
    },
    "78": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Transfer, Number",
    },
    "79": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Transfer, Reversal Number",
    },
    "80": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Inquiries, Number",
    },
    "81": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Authorizations, Number",
    },
    "82": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Credits, Processing Fee Amount",
    },
    "83": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Credits, Transaction Fee Amount",
    },
    "84": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Debits, Processing Fee Amount",
    },
    "85": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Debits, Transaction Fee Amount",
    },
    "86": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Credits, Amount",
    },
    "87": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Credits, Reversal Amount",
    },
    "88": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Debits, Amount",
    },
    "89": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Debits, Reversal Amount",
    },
    "90": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 42,
        "desc": "Original Data Elements",
    },
    "91": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 1,
        "desc": "File Update Code",
    },
    "92": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "File Security Code",
    },
    "93": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 5,
        "desc": "Response Indicator",
    },
    "94": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 7,
        "desc": "Service Indicator",
    },
    "95": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 42,
        "desc": "Replacement Amounts",
    },
    "96": {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Message Security Code",
    },
    "97": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 17,
        "desc": "Amount, Net Settlement",
    },
    "98": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 25,
        "desc": "Payee",
    },
    "99": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 11,
        "desc": "Settlement Institution ID Code",
    },
    "100": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 11,
        "desc": "Receiving Institution ID Code",
    },
    "101": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 17,
        "desc": "File Name",
    },
    "102": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 28,
        "desc": "Account ID 1",
    },
    "103": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 28,
        "desc": "Account ID 2",
    },
    "104": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 100,
        "desc": "Transaction Description",
    },
    "105": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "106": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "107": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "108": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "109": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "110": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "111": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "112": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "113": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "114": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "115": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "116": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "117": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "118": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "119": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "120": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "121": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "122": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "123": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "124": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "125": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "126": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "127": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "128": {
        "data_enc": "b",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "MAC",
    },
}

# ASCII
# All fields are in ASCII
default_ascii = {
    "h": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 0,
        "desc": "Message Header",
    },
    "t": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Message Type",
    },
    "p": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Bitmap, Primary",
    },
    "1": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Bitmap, Secondary",
    },
    "2": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 19,
        "desc": "Primary Account Number (PAN)",
    },
    "3": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "Processing Code",
    },
    "4": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Amount, Transaction",
    },
    "5": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Amount, Settlement",
    },
    "6": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Amount, Cardholder Billing",
    },
    "7": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Transmission Date and Time",
    },
    "8": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Amount, Cardholder Billing Fee",
    },
    "9": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Conversion Rate, Settlement",
    },
    "10": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Conversion Rate, Cardholder Billing",
    },
    "11": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "System Trace Audit Number",
    },
    "12": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "Time, Local Transaction",
    },
    "13": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Local Transaction",
    },
    "14": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Expiration",
    },
    "15": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Settlement",
    },
    "16": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Conversion",
    },
    "17": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Date, Capture",
    },
    "18": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Merchant Type",
    },
    "19": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Acquiring Institution Country Code",
    },
    "20": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "PAN Country Code",
    },
    "21": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Forwarding Institution Country Code",
    },
    "22": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Point-of-Service Entry Mode",
    },
    "23": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "PAN Sequence Number",
    },
    "24": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Network International ID (NII)",
    },
    "25": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "Point-of-Service Condition Code",
    },
    "26": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "Point-of-Service Capture Code",
    },
    "27": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 1,
        "desc": "Authorizing ID Response Length",
    },
    "28": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 9,
        "desc": "Amount, Transaction Fee",
    },
    "29": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 9,
        "desc": "Amount, Settlement Fee",
    },
    "30": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 9,
        "desc": "Amount, Transaction Processing Fee",
    },
    "31": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 9,
        "desc": "Amount, Settlement Processing Fee",
    },
    "32": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 11,
        "desc": "Acquiring Institution ID Code",
    },
    "33": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 11,
        "desc": "Forwarding Institution ID Code",
    },
    "34": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 28,
        "desc": "Primary Account Number, Extended",
    },
    "35": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 37,
        "desc": "Track 2 Data",
    },
    "36": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 104,
        "desc": "Track 3 Data",
    },
    "37": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Retrieval Reference Number",
    },
    "38": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "Authorization ID Response",
    },
    "39": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "Response Code",
    },
    "40": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Service Restriction Code",
    },
    "41": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 8,
        "desc": "Card Acceptor Terminal ID",
    },
    "42": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 15,
        "desc": "Card Acceptor ID Code",
    },
    "43": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 40,
        "desc": "Card Acceptor Name/Location",
    },
    "44": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 25,
        "desc": "Additional Response Data",
    },
    "45": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 76,
        "desc": "Track 1 Data",
    },
    "46": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Additional Data - ISO",
    },
    "47": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Additional Data - National",
    },
    "48": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Additional Data - Private",
    },
    "49": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Currency Code, Transaction",
    },
    "50": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Currency Code, Settlement",
    },
    "51": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Currency Code, Cardholder Billing",
    },
    "52": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "PIN",
    },
    "53": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Security-Related Control Information",
    },
    "54": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 240,
        "desc": "Additional Amounts",
    },
    "55": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 510,
        "desc": "ICC data",
    },
    "56": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved ISO",
    },
    "57": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved National",
    },
    "58": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved National",
    },
    "59": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved National",
    },
    "60": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved National",
    },
    "61": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved Private",
    },
    "62": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved Private",
    },
    "63": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved Private",
    },
    "64": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "MAC",
    },
    "65": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Bitmap, Extended",
    },
    "66": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 1,
        "desc": "Settlement Code",
    },
    "67": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "Extended Payment Code",
    },
    "68": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Receiving Institution Country Code",
    },
    "69": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Settlement Institution Country Code",
    },
    "70": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 3,
        "desc": "Network Management Information Code",
    },
    "71": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Message Number",
    },
    "72": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 4,
        "desc": "Message Number, Last",
    },
    "73": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 6,
        "desc": "Date, Action",
    },
    "74": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Credits, Number",
    },
    "75": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Credits, Reversal Number",
    },
    "76": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Debits, Number",
    },
    "77": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Debits, Reversal Number",
    },
    "78": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Transfer, Number",
    },
    "79": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Transfer, Reversal Number",
    },
    "80": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Inquiries, Number",
    },
    "81": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 10,
        "desc": "Authorizations, Number",
    },
    "82": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Credits, Processing Fee Amount",
    },
    "83": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Credits, Transaction Fee Amount",
    },
    "84": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Debits, Processing Fee Amount",
    },
    "85": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 12,
        "desc": "Debits, Transaction Fee Amount",
    },
    "86": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Credits, Amount",
    },
    "87": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Credits, Reversal Amount",
    },
    "88": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Debits, Amount",
    },
    "89": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Debits, Reversal Amount",
    },
    "90": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 42,
        "desc": "Original Data Elements",
    },
    "91": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 1,
        "desc": "File Update Code",
    },
    "92": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 2,
        "desc": "File Security Code",
    },
    "93": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 5,
        "desc": "Response Indicator",
    },
    "94": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 7,
        "desc": "Service Indicator",
    },
    "95": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 42,
        "desc": "Replacement Amounts",
    },
    "96": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "Message Security Code",
    },
    "97": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 17,
        "desc": "Amount, Net Settlement",
    },
    "98": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 25,
        "desc": "Payee",
    },
    "99": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 11,
        "desc": "Settlement Institution ID Code",
    },
    "100": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 11,
        "desc": "Receiving Institution ID Code",
    },
    "101": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 17,
        "desc": "File Name",
    },
    "102": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 28,
        "desc": "Account ID 1",
    },
    "103": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 2,
        "max_len": 28,
        "desc": "Account ID 2",
    },
    "104": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 100,
        "desc": "Transaction Description",
    },
    "105": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "106": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "107": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "108": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "109": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "110": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "111": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for ISO Use",
    },
    "112": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "113": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "114": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "115": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "116": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "117": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "118": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "119": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for National Use",
    },
    "120": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "121": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "122": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "123": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "124": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "125": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "126": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "127": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 3,
        "max_len": 999,
        "desc": "Reserved for Private Use",
    },
    "128": {
        "data_enc": "ascii",
        "len_enc": "ascii",
        "len_type": 0,
        "max_len": 16,
        "desc": "MAC",
    },
}
