> This page is for version v1.
> For other versions, use one of these documentation indexes:
> - v2 (default): https://developers.clearpay.co.uk/v-2/llms.txt
> - v1: https://developers.clearpay.co.uk/v-1/llms.txt

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://developers.clearpay.co.uk/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://developers.clearpay.co.uk/_mcp/server.

# GET Errors

With the exception of [Ping](/v-1/api-reference/online-api/service-status/ping), which does not require authentication, all GET endpoints can return any of the following errors:

| HTTP Status Code            | errorCode            | Description                                                                                                             |
| :-------------------------- | :------------------- | :---------------------------------------------------------------------------------------------------------------------- |
| **401**  Unauthorized       | `unauthorized`       | Invalid Merchant API credentials were passed in the `Authorization` header.                                             |
| **405**  Method Not Allowed | `method_not_allowed` | The request was made by a HTTP Method other than `GET`, `HEAD` or `OPTIONS`.    For example, `POST`, `PUT` or `DELETE`. |
| **406**  Not Acceptable     | `error`              | The request included an `Accept` header for something other than `application/json` or `*/*`.                           |