With Android Pay, you've the added flexibility of selling physical goods and services, such as clothing or movie tickets, through your apps using the Android Pay API (US Only).
You can use this option where your app is the store-front for retail or webtail operations. However, you can also combine it with your premium and freemium apps by offering related products.
Your customers purchase goods and services with credit or debit card payment methods. Android Pay helps you minimize user data entry by enabling your payment flow to retrieve information directly from the user's Google account.
You also keep your existing payment infrastructure and leverage Android Pay to optimize your payment flow — users can make purchases in as a few as two clicks and the flow is simplified with features to retrieve information directly from the user’s wallet and intelligent auto-completion of addresses.