# Mobile Buy SDK Sample Swift AppThe Swift sample app demonstrates how to use the SDK within a Swift app. The app includes an Objective-C bridging header.### Getting startedFirst, add your shop domain, API key and Channel ID to the `ViewController.swift`.```swiftletshopDomain=""letapiKey=""letchannelId=""letproductId=""```### OverviewThe sample app also demonstrates how to use the `BUYClient` to obtain a product by calling `getProductById()`.```swiftclient.getProductById(productId){(product,error)->Voidin}```