> For the complete documentation index, see [llms.txt](https://developers.docstudio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.docstudio.com/api-documentation/common-api-error-codes.md).

# Common API Error Codes

<table><thead><tr><th width="89">Code</th><th width="201.7999267578125">Error</th><th>When it happens</th></tr></thead><tbody><tr><td>400</td><td>Bad request</td><td>Request data is invalid or doesn’t match the API docs. The response can include a detailed issue description.</td></tr><tr><td>401</td><td>Unauthorized</td><td>Auth token is invalid, incorrect, or expired.</td></tr><tr><td>402</td><td>Payment Required</td><td>Billing denies functionality due to missing payment or plan restrictions.</td></tr><tr><td>403</td><td>Forbidden</td><td>The caller doesn’t have access or permissions for the requested entity. The response can include a detailed issue description.</td></tr><tr><td>404</td><td>Not found</td><td>The requested entity doesn’t exist or was deleted (hard delete).</td></tr><tr><td>409</td><td>Conflict</td><td>Rare. Appears when two entities conflict. Usually retried, so users don’t see it.</td></tr><tr><td>410</td><td>Entity gone</td><td>The requested entity was deleted (soft delete). Example: a template was deleted while being processed.</td></tr><tr><td>422</td><td>Unprocessable entity</td><td>The requested entity can’t be processed. Example: approve/reject the same envelope twice.</td></tr><tr><td>425</td><td>Too early</td><td>The request was sent too early. Example: the endpoint enforces a minimum time period between requests.</td></tr><tr><td>429</td><td>Too many requests</td><td>Too many requests were sent to the endpoint and you exceeded the rate limits.</td></tr></tbody></table>