Hello, I'm starting making an app for a website that I own. I know some about programming with xcode but there's a lot of stuff that I don't know yet.. Mostly I have almost everything figured out for the app but I need to add to the app a way to sign in and sign up to the website and also a way to pay with credit card. I don't know how to start with all that. I have tried to look some videos but I didn't see anything similar to what I want to do. I would really appreciate if you could explain me it, or send me some kind of help. You also could answer to my email: email@example.com Thank you very much, Emilio Note: In that website people can buy tickets for concerts and stuff.