HPZone_setup: Initialisation function to define API credentials. This function must be called before anything else, as the details supplied in this call are required for use.
Note that client_id and client_secret should preferably not be supplied in this call, but rather stored using [HPZone_store_credentials()].
Description
Initialisation function to define API credentials. This function must be called before anything else, as the details supplied in this call are required for use.
Note that client_id and client_secret should preferably not be supplied in this call, but rather stored using [HPZone_store_credentials()].