Returns the offer class with the given class ID.
The URL uses gRPC Transcoding syntax.
The unique identifier for a class. This ID must be unique across all classes from an issuer. This value should follow the format issuer ID.identifier where the former is issued by Google and latter is chosen by you. Your unique identifier should only include alphanumeric characters, '.', '_', or '-'.
The request body must be empty.
If successful, the response body contains an instance of
Requires the following OAuth scope: