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internet secure help


mhaskell

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  • 1 year later...

All credit card numbers are generated with a specific formula, not just any random 16 numbers. It seems to me that WHMCS checks this formula first, then sends it through the gateway for final approval.

 

Try using a dummy number following these guidelines:

 

http://www.creditcards.com/credit-card-news/luhn-formula-credit-card-number-system-1273.php

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