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faq:troubleshooting_msg_invalid_check_digit

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faq:troubleshooting_msg_invalid_check_digit [2010/10/26 10:11] (current)
cliff created
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 +Parent Article: [[:​faq:​troubleshooting_mercury_processing_behaviors_credit_card_error#​invalid_check_digit|Troubleshooting Credit Card Results From Mercury Payments]]
 +
 +
 +
 +====== Invalid Check Digit ======
 +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.
 +
 +
 +
 +===== Does this message come from System Five, the processor, Mercury Payments, or elsewhere? =====
 +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. 
 +
 +
 +===== Why does it happen? =====
 +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.
 +
 +
 +
 +
 +===== Who does this apply to? =====
 +This only applies when you manually enter a card number for authorization. ​
 +
 +
 +===== What causes this error? =====
 +  * A Mistake in manual entry of a card number.
 +  * Please note there is a situation where if a card swipe is not configured correctly with the % prefix and you get a bad swipe this message can appear. ​
 +
 +
 +===== When does it happen? =====
 +When you can't swipe the card and have to enter the card number manually.
 +
 +
 +
 +===== Can it be prevented? =====
 +Yes, easily.
 +
 +
 +==== If so, how can it be prevented? ====
 +This problem can easily be prevented by double checking the credit card number before typing it in. 
 +
 +
 +
 +===== Is there any documentation available on this error? =====
 +No external references found at this time Oct 25, 2010-cm
 +
  
faq/troubleshooting_msg_invalid_check_digit.txt ยท Last modified: 2010/10/26 10:11 by cliff