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I'm developing an app that will have to process payments that can potentially even be international. The first payment gateway that comes to mind is PayPal. Is there a simple guide about how to integrate PayPal with Android Studio or Xcode with Firebase as the backend?

Also, how do I integrate Adaptive Payments?

If you think, PayPal doesn't fit the bill, please feel free to suggest other payment gateways and the way in which I should integrate it.

PS: I have seen the SDK for PayPal but I'd like some first hand knowledge from somebody.

Arjun Ram
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You will find at the following URL an example (from Firebase) on how to implement Paypal payment with Cloud Functions (with the advantage that everything is done in the -serverless- backend):

https://github.com/firebase/functions-samples/tree/master/paypal

Renaud Tarnec
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