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

# Unsupported grant type

# `unsupported_grant_type`

| HTTP | When                               |
| ---- | ---------------------------------- |
| 400  | The `grant_type` is not supported. |

Only `authorization_code` and `refresh_token` are supported. There is
no implicit grant, no password grant, and no client-credentials grant.
See [OAuth](../oauth.md#tldr).