the side printed by the printer in the game at the time of cash out 502 and an image shape 504 whose configuration and position is based upon the content of a validation number either human readable 506 or bar code 508 in accordance with the present invention the validation number is a number generated by the cashless enabled game and is used to track the validity of the cash out transaction taking this number and generating a unique security key can be done by various means including hashing hamming or other algorithms this unique key can then be used to specify to the voucher printer a specific shape and location for that shape to be printed on the voucher in addition a bill acceptor voucher validator can also read the validation number either through the bar code or recognition of the validation number and verify the shape printed on the voucher matches that predicted by unique key generated from the validation number as mentioned in another voucher printer the validation number or portions thereof which is provided by the gaming cash out system and printed on the vouchers would be used in a hash algorithm to instruct the printer on algorithm adjustment aspects of imaging the thermally sensitive side of the voucher and the same validation number portion being used to instruct the bill acceptor voucher validator to scan for the same aspects which were produced by the printer 0041 fig6 is a block diagram of a voucher printer controller used in a voucher printer in accordance with an exemplary embodiment of the present invention a voucher printer controller 600.