Services needed to obtain tokens for OAuth 2.0 secured API's ###### Error codes and their causes In addition to the response codes that apply to all API's the OAuth provider API's has some special error situations which are briefly explained below. For more information regarding error handling see the page on error handling.

Situation	Results
Invalid redirect_uri query parameter provided	Invalid redirect_uri query parameter provided \| This returns a HTTP 200 with an error message. See the page with error explanations for more details.
The authorization server encountered an unexpected condition that prevented it from fulfilling the request	This returns a HTTP 302 redirect to the redirect_uri with query parameter `/?error=server_error`
The resource owner or authorization server denied the request.	This returns a HTTP 302 redirect to the redirect_uri with query parameter `/?error=access_denied`
The requested scope is invalid, unknown, or malformed.	This returns a HTTP 302 redirect to the redirect_uri with query parameter `/?error=invalid_scope`

Next to the error query parameter that is added to the redirect uri during an error flow, a additional optional query parameter called error_description can be added which a more human readable explanation on what went wrong.