# Code and formats
source: https://developer.mastercard.com/mastercard-buyer-payment-agent/documentation/codes_formats/index.md

## HTTPS Response Codes {#https-response-codes}

| HTTPS Status Code |         Description          |
|-------------------|------------------------------|
| 200               | OK                           |
| 201               | Payment Instructions Created |
| 401               | Unauthorized                 |
| 403               | Forbidden                    |
| 404               | Not Found                    |

## Gateway Error Codes {#gateway-error-codes}

Refer to the [Gateway Error Codes](https://developer.mastercard.com/platform/documentation/gateway-error-codes/) page for more information on errors that you may encounter with the gateway.