For the purpose with helping our customers make a payment easily, currently our system supports to make in-app payment through the only action:

Our customers just need to pay one time on apps, and the rest steps will be implemented by Server. Please kindly take a look the following imagine which clarifies more on our system.

We have integrated with lots of payment gateways in other markets and our flow has wholly stable operation. So we would be grateful if you could provide us with anyway to authenticate transaction without showing authenticate-URL for customers.