When your customer decides to purchase an item that is offered in your app, it is your responsibility to give the user a smooth, fast, and pain-free payment experience. Thankfully, Apple has taken the brunt of this effort by implementing Apple Pay. Users do not have to dig up their credit cards and enter shipping addresses to complete an order, even if it is the first time that they use your app. By asking only for the information that is strictly necessary to perform a transaction, you provide your customers with a compelling purchasing experience, which will encourage subsequent purchases from your app.
This chapter describes the things that your app needs to do to give its users a pleasant shopping experience, one in which the barrier between desiring something and having this product shipped to your doorstep is reduced to the gentle touch of a smooth, round button. At the same time, you reduce or eliminate the need to ask for and store your customers...