API Authentication Errors

You may get a non-200 JSON error like the following, with error_description containing details.

    {
        "error": "invalid_request",
        "error_description": "error_description"
    }

error	returned when
`invalid_request`	The request is missing a required parameter, or includes an unsupported or incorrect parameter.
`invalid_client`	Client authentication failed (e.g. unknown client, no client credentials included, multiple client credentials included, or unsupported credentials type).
`unauthorized_client`	The client is not authorized to request an authorization code using this method.
`access_denied`	The resource owner or authorization server denied the request.
`invalid_scope`	The requested scope is invalid, unknown, or malformed.
`unsupported_response_type`	The authorization server does not support obtaining an authorization code using this method.
`account_mismatch`	The authentication account id supplied with the request does not match the current account id associated with this authorization session.