Has anyone done the Apple Pay integration before?
No the native integration directly with Apple
Are you familiar with payment processing?
If you are not, I’d highly recommend using Stripe or another payment provider to implement Apple Pay functionality. Learn more here.
From Apple—
Payment Providers
Using an SDK or JS API from a payment provider that supports Apple Pay is highly recommended. The alternative is to provide your own server-side solution to receive payments from your app or website, decrypt payment tokens and interface with the payment provider to process the authorization. Handling credit and debit card payments can be complicated and unless you already have the expertise and systems in place, an Apple Pay SDK or JS API from a payment provider is the quickest and most reliable way to support Apple Pay in your app or website. Contact your platform or payment provider for more information.
Thank you, this is really helpful 
I have tried to persuade the person I am helping out to use Stripe for Apple Pay but he wants to do Stripe + Apple Pay integration. Focusing on the wrong things instead of their USP!
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