The payload to this endpoint can either be a form-data or a base64 encoded media file via the requests JSON body.
Form-data sent to this endpoint must use the key media_key and the value as the media file. If you wish to provide optional information, use the media_key and provide stringified JSON data as the value. There are no required fields in each media file's supplementary form data. However, if a recognized media_type value is provided, the Unit21 system will be able to use the media object for purposes such as document verification.