The term annuity, as used in financial theory, is most closely related to what is today called an immediate annuity. This is an insurance policy which, in exchange for a sum of money, guarantees that the issuer will make a series of payments.
MFBKUS44 Swift / BIC code - MIDFIRST BANK bank - OKLAHOMA CITY,OK - UNITED STATES (US) Swift Code also known as BIC Code is a unique bank identifier used to verify financial transactions such as a Bank Wire Transfer. The Bank Swift Code provides information about the bank and branch where the money should be transferred.
This is common practice, a local branch may not have access to swift, a head office bic is commonly used to route payments. The IFSC code would then be used to route to your branch. If in doubt, check with your bank to confirm details.