Query Parameters
To retrieve webhook subscriptions in test mode, set this to test. For production webhook subscriptions, set it to live. Defaults to live if not specified.
Available options: 
test, live Retrieve a list of all webhook subscriptions configured for your vendor.
Use the env_mode query parameter to specify the environment.
To retrieve webhook subscriptions in test mode, set this to test. For production webhook subscriptions, set it to live. Defaults to live if not specified.
test, live