4. How do payments work in apps?

5. What's happening in the background?

6. Let’s break all this into modules

7. Collecting user details

8. Let’s break all this into modules

9. Payment gateway module

10. Let’s break all this into modules

11. Payment logic module

12. Let’s break all this into modules

13. Notification module

14. Let’s break all this into modules

15. Success and error interface module

16. How to speed up engineering of such engine?

17. What do we do?

18. Mobile Payments Library

19. Configurable Payments

20. More information
https://www.x.com/developers/paypal
https://www.x.com/developers/paypal/products/mobile-payment-libraries
Developer tech support team:
https://www.paypal.com/dts

21. Q&A