This protocol is a much simpler interface to the Carwings telematics information. The original protocol was an XML SOAP API and was a bit of a pain to work with.
Every operation is executed as a simple HTTP GET request and responds with JSON documents. Parameters for the operation are encoded on the querystring.
The only operation that requires any kind of credentials is the User Login operation. All other operations take the DCMID and the VIN of your vehicle as parametersfor authorizing the requested operation.
All of the responses documents have a message and status property to signal operation success/failure messages and status. The status seems to mirror the HTTP reponse code and message seems to be "success" for successful operations.