Mobile Buy SDK
You can use the iOS and Android Buy SDK to integrate Shopify checkout into your mobile applications in iOS and Android. This lets you sell any of your physical products through the app and track sales info in your Shopify admin.
The SDK is available for the following platforms:
Before beginning your app development, create a private app to generate a storefront access token and optionally configure your Mobile Buy SDK settings. When creating your private app, make sure to enable Allow this app to access your storefront data using the Storefront API. The access token is generated when you save the private app, and you include this access token with any calls made from the Mobile Buy SDK to Shopify.