| 100 | Approved | Successfully approved. |
| 201 | Invalid Account Number | Bad check digit, length, or other problem. |
| 202 | Bad amount | Amount sent was zero. |
| 203 | Bad amount | Amount sent was zero. |
| 204 | Other Error | Unidentifiable error. |
| 205 | Bad total amount | Amount sent was zero. |
| 223 | Does not match MOP | Credit card number does not match method of payment. (MOP) |
| 253 | Invalid tran type | Invalid transaction type for this order. |
| 302 | Credit floor | Insufficient funds. |
| 303 | Processor decline | Generic decline, no other reason given provided by the card issuer. |
| 304 | Not on file | Non-existent account. |
| 305 | Already reversed | Transaction previously reversed. |
| 401 | Decline | Decline. |
| 402 | Default Call | Decline. |
| 501 | Pickup | Card stolen. |
| 502 | Lost/Stolen | Card reported as lost or stolen. |
| 503 | Security violation | Fraud security code does not match. |
| 505 | Negative file | Account on negative file list. |
| 509 | Over the limit | Exceed withdrawal or activity limit. |
| 510 | Over limit frequency count | Exceed withdrawal or activity count limit. |
| 521 | Insufficient funds | Insufficient funds or over credit limit. |
| 522 | Card is expired | Card has expired—not the same as invalid expiry date. |
| 530 | Do not honor | Generic decline—no reason given by card issuer. |
| 531 | CVV2 failure | Issuer declined because CVV2 failed. |
| 550 | Closed account | New account issued. |
| 570 | Stop payment | Cardholder requests recurring payments be stopped. |
| 571 | Revocation | Cardholder requests recurring payments be stopped. |
| 591 | Bad account number | Bad check digit or other problem. |
| 594 | Other error | Unidentifiable error issuer generated. |
| 596 | Suspected Fraud | Issuer has flagged this account as fraudulent. |
| 605 | Bad expiration date | Card has expired. |
| 606 | Invalid Transaction type | Issuer does not allow this type of transaction. |
| 806 | Restraint | Card has been restricted. |
| 825 | No account | Account does not exist. |
