Refunds a user's subscription purchase, but the subscription remains valid until its expiration time and it will continue to recur.
||The package name of the application for which this subscription was purchased (for example, 'com.some.thing').|
||The purchased subscription ID (for example, 'monthly001').|
||The token provided to the user's device when the subscription was purchased.|
This request requires authorization with the following scope (read more about authentication and authorization).
Do not supply a request body with this method.
If successful, this method returns an empty response body.