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Parent Article: Troubleshooting Credit Card Results From Mercury Payments
This is an error message that shows on the slip reciept. This message only happens when you type in a credit card manually. It means that you mistyped the number and then requested and authorization.
This is a DSIClientX Specific (TCP/IP> Message from Data Cap. There are messages from System Five before you request the Authorization that also tell you the card was mistyped. This message is “Invalid Checksum”. It shows up in black text on screen in the green authorization window within System Five.
Since the card number is not correct your processor will not process it. There is a formula used to calculate the last digit of the credit card. This digit is like a key that only works with the customers credit card. Since there is a formula, you don't get problems where when someone else with a simular card number transposes 2 digits of the credit you don't get charged for their purchase. It is not 100% perfect, but is very reliable.
This only applies when you manually enter a card number for authorization.
When you can't swipe the card and have to enter the card number manually.
Yes, easily.
This problem can easily be prevented by double checking the credit card number before typing it in.
No external references found at this time Oct 25, 2010-cm