> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gate.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Error Codes

> Summarizes common GatePay error codes, their meanings, and recommended handling actions.

| HTTP Status | Error Code | Description                                          | Solution                                                                                           |
| ----------- | ---------- | ---------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
| `500`       | `300000`   | System error                                         | System exception, please retry with the same parameters                                            |
| `500`       | `300001`   | Internal error                                       | System exception, please retry with the same parameters                                            |
| `500`       | `400000`   | Unknown error                                        | System exception, please retry with the same parameters                                            |
| `200`       | `400001`   | Request parameter format error                       | Check request data parameters and format                                                           |
| `200`       | `400002`   | Signature verification failed                        | Check if the merchant's signature is correct                                                       |
| `200`       | `400003`   | Request timestamp timed out                          | Check the timestamp field in the request header                                                    |
| `200`       | `400007`   | Unsupported media type                               | Check the media type set in the interface                                                          |
| `200`       | `400020`   | Signature random number error                        | Please check whether the random number is empty                                                    |
| `200`       | `400201`   | Merchant order number already exists                 | Please verify whether the merchant order number has been submitted repeatedly                      |
| `200`       | `400202`   | Order does not exist                                 | Check whether the order has been traded or whether the order number is correct                     |
| `200`       | `400203`   | Merchant number does not exist                       | Check whether the merchant number is correct                                                       |
| `200`       | `400204`   | Order status is incorrect                            | Check whether the order has expired, canceled, or closed, and use the query interface if necessary |
| `200`       | `400205`   | Invalid currency                                     | Check the currency type of the order                                                               |
| `200`       | `400304`   | Refund ID does not exist                             | Check the requested refund ID                                                                      |
| `200`       | `400603`   | Order timed out                                      | Please verify whether the order has expired                                                        |
| `200`       | `400604`   | Invalid refund-related transaction order             | Check whether the refund transaction order is in a completed state                                 |
| `200`       | `400605`   | Insufficient balance in the payment account          | Insufficient balance in the payment account                                                        |
| `200`       | `400607`   | Too many refunds                                     | The number of refunds exceeds the limit                                                            |
| `200`       | `400608`   | Refund amount exception                              | Please check the refund amount                                                                     |
| `200`       | `400620`   | Duplicate order payment                              | Please verify whether the merchant order number has been submitted repeatedly                      |
| `200`       | `400621`   | Incorrect payment amount                             | Check the requested amount                                                                         |
| `200`       | `400622`   | Exchange rate fluctuations result in payment failure | You can try to apply again                                                                         |
| `200`       | `400623`   | Unsupported currency payment                         | Check the payment currency                                                                         |
| `200`       | `400624`   | Invalid order status notification address            | Check whether the callback address provided by the merchant is valid                               |
| `200`       | `500008`   | Corresponding merchant not found                     | Check whether the requested merchant ID is correct                                                 |
| `200`       | `500100`   | Payment QR code expired                              | Reorder and generate a new QR code                                                                 |
| `200`       | `500101`   | Duplicate payment QR code                            | Please verify the order status                                                                     |
| `200`       | `500103`   | Address payment exchange currency error              | Exchange rate fluctuations affect the conversion                                                   |
| `200`       | `500203`   | Unable to query order details for address payment    | Please check whether the address is correct                                                        |
| `200`       | `500204`   | Invalid recipient ID for refund transaction order    | Please confirm that the recipient of the refund is a Gate user                                     |
| `200`       | `500205`   | Refund currency does not match                       | Please ensure that the refund currency is one of the order currency or the user's payment currency |
| `200`       | `500206`   | Refund amount exceeds limit                          | Please check the refund amount of the order                                                        |
| `200`       | `500207`   | Unable to find the refund order for address payment  | Please confirm whether the refund was successful or check whether the address is correct           |
| `200`       | `500208`   | Cannot refund orders without a converted address     | Please confirm the type of refund order                                                            |