| 100 | Transaction was successful. |
| 101 | Request is missing one or more required fields. Examine the response fields. |
| 102 | One or more fields in the request contain invalid data. |
| 104 | Duplicate merchant reference code. Resend with a unique reference code. |
| 105 | Duplicate Merchant Transaction Identifier (MTI). |
| 110 | Only a partial amount was approved. |
| 150 | System error. |
| 151 | Server timeout occurred. |
| 152 | A service did not finish in time. |
| 153 | Account not enabled for OCT. |
| 154 | MAC validation failure. |
| 200 | AVS failed despite issuing bank approval. |
| 201 | Issuing bank has questions. |
| 202 | Card expired. |
| 203 | Card declined without further info. |
| 204 | Insufficient funds. |
| 205 | Card lost/stolen. |
| 207 | Issuing bank unavailable. Retry later. |
| 208 | Card inactive or not authorized for card-not-present transactions. |
| 209 | CVN mismatch. |
| 210 | Credit limit reached. |
| 211 | Invalid CVN. |
| 212 | EMV rejected. Use chip and PIN. |
| 213 | Account is in fraud watch. |
| 216 | Invalid card data. |
| 220 | Generic decline. Use different payment. |
| 221 | Account is frozen. |
| 222 | Customer on processor’s negative list. |
| 230 | CVN verification failed after approval. |
| 231 | Invalid account number. |
| 232 | Processor does not accept this card type. |
| 233 | Card declined. See Business Center for details. |
| 234 | Incorrect account information. |
| 235 | Capture amount exceeds authorization. |
| 236 | Processor failure. Retry later. |
| 237 | Transaction already captured. |
| 238 | Transaction already reversed. |
| 239 | Mismatch with previous transaction amount. |
| 240 | Invalid card type or number mismatch. |
| 241 | Card declined by processor. |
| 242 | No unused authorization for capture. |
| 243 | Transaction already settled/reversed. |
| 244 | Account failed verification. |
| 246 | Capture/credit info already submitted. |
| 247 | Credit requested for previously voided capture. |
| 248 | Boleto declined by processor. |
| 250 | Timeout at payment processor. |
| 251 | Debit card usage limit exceeded. |
| 254 | Stand-alone credits not allowed. |
| 256 | Credit exceeds account limit. |
| 257 | Gift/prepaid card already active. |
| 259 | Reload limit exceeded. |
| 260 | Amount outside gift/prepaid card limits. |
| 261 | Merchant setup invalid or missing. |
| 262 | Request in progress. |
| 263 | MTT declined. |
| 264 | Missing processor field. |
| 268 | Transaction error: unable to confirm. |
| 400 | Fraud score too high. Review order. |
| 403 | Communication error or invalid API key. |
| 428 | SCA exemption declined. |
| 450–460 | Address verification errors (missing, invalid, not found, etc.). |
| 461 | Unsupported character set. |
| 465 | Payer authentication failed. |
| 474 | PIN required. |
| 475 | Cardholder enrolled in authentication. Authenticate. |
| 476 | Payer authentication issue. |
| 478 | SCA required for transaction. |
| 480 | Order flagged for review. |
| 481 | Order rejected by Decision Manager. |
| 490 | Acquirer not accepting transactions. |
| 491 | Transaction not accepted due to specific acquirer/aggregator limits (e.g., OVER_LIMIT, BIN_REFUSED, CARD_REFUSED). |
| 520 | Authorization approved but declined due to Smart Authorization settings. |
| 700 | Customer matched Denied Parties List. Order rejected. |