IOS payments solutions + Any Paypal workaround?

Hi guys, I have a Ionic Angular Project with capacitor for a mobile app.
The questions are the following:

  • What are the best and reliable solutions for payments in IOS ?

  • Also need a walkaround for Paypal:
    Is it possible to implement a button solution using only angular js and including paypal js library?
    Or handle it with something like a In App browser ?

Thanks in advance