Revoke Purchase
To implement the Revoke API using the SDK, implement one abstract method from the PurchaseServlet class: revokePurchase.
/**
* Process the revoke purchase request and return the response to whether or not the
* request succeeded.
*
* @param request
* the request relative to the revoke purchase
*
* @return a RevokePurchaseResponse object
*/
public abstract RevokePurchaseResponse revokePurchase(RevokePurchaseRequest request);