I'm developing an iOS app which uses PayPal as a payment platform. Paypal iOS SDK doesn't support my country, so I have to integrate PayPal using REST API.

It was successful until the "order" api call and displaying the PayPal payment window in the webview. However, I am not sure how to return to the app after completing the payment. Usually, in the case of such payment or login services, there is a return URL and I add it to the URLScheme. But I cannot find how to do it in PayPal API.

Is there anyone who can help?