public void createBilling(FaspayPaymentRequest mRequest, FaspayCreateBillingServiceCallback mCallback)
        {
            this.mHandler = mCallback;
            String     obj = JsonConvert.SerializeObject(mRequest);
            JsonObject o   = (System.Json.JsonObject)JsonObject.Parse(obj);

            sendRequestHttpPost(mFaspayConfig.getCreateBillingUrl(), o, new CreateBillingCallback(mCallback));
        }
 public CreateBillingCallback(FaspayCreateBillingServiceCallback mCallback)
 {
     this.mCallback = mCallback;
 }