Refunds a user's subscription purchase, but the subscription remains valid until its expiration time and it will continue to recur.
The URL uses gRPC Transcoding syntax.
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.
The request body must be empty.
If successful, the response body will be empty.
Requires the following OAuth scope: