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I tried to make a purchase, but I got an error. What do I do now?
  It could be one of many possibilities. Here are the most common error messages and what they mean…
Decline
Serv Not Allowed
Invalid Trans
or Do Not Honor
Each of these is a type of error that is sent by your card provider. For whatever reason, the bank or card provider is declining the transaction. We are given no further details regarding the transaction failure. It is recommended that you double check your payment information and attempt to submit it again. If the error persists, please contact your bank or credit card provider for assistance.
Invalid Card Number
or Card No. Error
This error indicates that you did not enter your credit card number correctly. Please return to the payment screen, double check the card number, and attempt payment again. If the error persists, please contact your bank or credit card provider for assistance.
Expiration Date Your expiration date was not correctly entered or not entered at all. Please return to the payment screen, double check your expiration date, and try again.
Invalid Card Type
or Card Type Refused
This error indicates that the card type is not accepted. We accept Visa, MasterCard, American Express, and Discover. Debit cards that do not have a credit card logo on them are not accepted.
CVV You did not enter the correct CVV code for your credit card. The CVV code is the three-digit number on the back of the card. Please return to the payment screen, double check the CVV code, and try again.
Issuer Unavailable
or Time Out
These errors indicate that a response was not received when we sent the payment information for processing. Please return to the payment screen and try again. If the same error occurs, you may need to wait a few minutes for the merchant processor or your card provider to resolve the issue.
Please Enter a Valid Street/City/State/Zip Your address was not formatted correctly or you left a field blank. Please return to the payment screen enter the address exactly as it appears on the statements that you receive from your bank.
Summary

Still unable to complete your transaction? Contact us for assistance.

Special acknowledgement to the University of Washington, from whose website these concise descriptions were found.