If you read the part 1 of the Apple payment method integration, and followed it step-by-step, then you now already have a lightweight server to accept payments.
Now the next part would be to implement Stripe payment method gateway in that Apple pay.
And here, in order to help you, I’ve written an article on Stripe Payment Integration to help you implement it in your iOS App.
If you face any issue implementing it, you can contact me for help. Also, if you want to implement Apple pay in your iOS app and looking for iPhone App Development Company to help you, then you can contact Space-O Technologies for the same.