There are many different iOS versions and devices out there in the wild. Supporting more than just the latest is often necessary since not all users upgrade immediately. This tutorial shows you how to achieve that goal.
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Pietro is an iOS Developer at the Huffington Post. He enjoys working on projects large and small and jokes about Objective-C being his native language.
You can find Pietro on Twitter.
In this tutorial, you are going to learn how to accept credit cards in iOS using a service called Stripe, a pain-free, developer-centric way to handle purchases in your apps.