Function Module for Discover Credit Card

We have Payment Credit Card types set up in the SAP system as American Express, Master Card and Visa Card. These use the following Function Modules CCARD_CHECK_AMEX, CCARD_CHECK_MC and CCARD_CHECK_VISA respectively.
We want to add Discover Credit Card. Does anybody know how to create a Function Module for it, or where do I get the specifications for the sme?
Please advice.
Thank You.

Hello Sujeet,
have a look at http://en.wikipedia.org/wiki/Credit_card for the checksum of Credit Card's. I think this function is implemented in CCARD_CHECK_LUHN_MOD_TEN. I think you should try to copy CCARD_CHECK_VISA to Z_CCARD_CHECK_DISCOVER and adapt this module to your needs.
Regards
Gregor

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