| Unauthorized | Validation-Token is malformed or not present. | Please ensure that you are passing the correct Validation-Token for the environment you are using. |
| Invalid Card Number | Credit card number is invalid. | |
| Invalid Expiration Date | Format of the expiration date is invalid. | |
| Card Expired | The Matbia card has expired. | |
| Insufficient Wallet Balance | The donor's balance is insufficient to cover the donation amount. | |
| Transaction is already batched, please issue a refund | When calling the Void API on a transaction that has already been batched. | Please call the Refund API instead. |
| Transaction not batched, please Void it | When calling the Refund API on a transaction that has not been batched yet. | Please call the Void API instead. |
| Input string was not in a correct format. | Any optional fields that are blank should be replaced with null. | |