The error codes you receive can depend on the data and data formats included in the call. For instance, the key values such as organizerKey, webinarKey, etc., are all numeric. Passing an incorrect key value may return different error messages than if you include alphabetic characters or non-numeric characters. This link provides API status code explanations. For a general overview, or if you encounter codes not documented here, see the WWW3 organization’s Hypertext Transfer Protocol.