Revoke Purchase

To implement the Revoke API using the SDK, implement one abstract method from the PurchaseController class: ProcessRevokePurchase.

        /// <summary>
         /// Processes Revoke Purchases requests.
         /// </summary>
         /// <returns>A <see cref="Task{T}"/> of <see cref="RevokePurchaseResponse"/> or an exception if bill once purchases are not supported.</returns>
         protected override Task<RevokePurchaseResponse> ProcessRevokePurchase(PurchaseRequest purchaseRequest);