Can u use PayPal on Apple pay

PayPal and Apple Pay are two similar services. Since they are both a service, no, they do not function together. If you are referring to a PayPal branded credit card, then yes, you may add that card to be used with Apple Pay on your device.

Yes you can . You can’t use as many payment methods you want. I don’t know the limit but for all I know you can add many payment methods