Here’s the algorithm for checksumming a credit card number, plus information on what all the fields are.
But you can checksum the numbers all you like, if the signature doesn’t match the transaction never happened.
Geek Rant dot org
Here’s the algorithm for checksumming a credit card number, plus information on what all the fields are.
But you can checksum the numbers all you like, if the signature doesn’t match the transaction never happened.
I love that prank. Amazing how much you can get away with. I heard recently that they’re planning to replace the signature with a PIN. Probably better security.