> For the complete documentation index, see [llms.txt](https://help.clickatell.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.clickatell.com/developers-api-reference/developers-archive/sms-rest-api-overview/response-status-codes.md).

# Response status codes

The REST API may respond with any of the following HTTP status codes:​

<table data-header-hidden="false" data-header-sticky><thead><tr><th>Status Code</th><th></th><th>Detail</th></tr></thead><tbody><tr><td>200</td><td>OK</td><td>The request was successfully completed.</td></tr><tr><td>202</td><td>Accepted</td><td>The message(s) will be processed.</td></tr><tr><td>207</td><td>Multi-status</td><td>More than one message was submitted to the API, however, not all messages have the same status.</td></tr><tr><td>400</td><td>Bad request</td><td>Validation failure (such as missing/invalid parameters or headers).</td></tr><tr><td>401</td><td>Unauthorized</td><td>Authentication failure. This can also be caused by IP lockdown settings.</td></tr><tr><td>402</td><td>Payment required</td><td>You do not have enough credits to send messages.</td></tr><tr><td>404</td><td>Not found</td><td>The action was performed on a resource that does not exist.</td></tr><tr><td>405</td><td>Method not allowed</td><td>HTTP method is not supported on the resource.</td></tr><tr><td>410</td><td>Gone</td><td>The mobile number is blocked, delisted or cannot be routed.</td></tr><tr><td>429</td><td>Too many requests</td><td>Generic rate-limiting error.</td></tr><tr><td>503</td><td>Service unavailable</td><td>A temporary error has occurred on our platform – please retry.</td></tr></tbody></table>

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