OAuth error codes

The following implementation-specific error codes are currently defined. They are part of the error_description.

not_implemented – request not implemented
access_denied – access denied
missing_signature – missing request signature header
invalid_signature – invalid request signature
invalid_parameters – invalid parameters
invalid_client_secret – wrong API key
token_refresh_error – error occurred while refreshing a token
token_create_error – error occurred while creating a token
invalid_device_code – invalid or expired device code
invalid_client_id – invalid client id
authorization_pending – authorization pending, keep polling
invalid_response_type – invalid response type parameter
invalid_key_type – invalid key type parameter
invalid_endpoint – client not found in the database
endpoint_not_authorized_for_device_token_refresh – endpoint is not authorized for the token refresh operation
invalid_client_for_signature_verification – cannot verify signature for client
invalid_grant – the given grant type is not supported
duplicate_client_id – the device is attempting to register using a client_id that is already associated with another device. Please contact the administrator.
error_saving_endpoint – there was en error when saving the endpoint
token_create_error – error occurred while issuing a token
authorization_pending – authorization pending
expired_device_code – the provided device code has expired