I wanted to know how would I set up Apple Pay in my app, and also in-app purchases. I already have the prices I want. So how would I do this? I have my app set up so you select a type of ride and ride length then it takes you to a PriceView where it shows what you selected and how much it cost. I want it so that when you are in the PriceView and you tap the book button it asks you to pay.

I have a label with a minus and plus button beside it. What I want it to do is increment the value of the label by 1 if the plus button is tapped, and subtract 1 if the minus button is tapped.