Step 1: Add Account Linking Options to Your App

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Account linking button guidelines

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iOS app

1. Open your Xcode IDE and open your storyboard.
2. Add a UIbutton to your view controller and name it something like “Link your account with Alexa”. Consider using a name that indicates the benefit that the user gets by linking their account, such as “Listen to your music with Alexa”, “Use Alexa to order a car with Ride Hailer”.
3. On the top left of the Xcode IDE, click Show the assistant editor.
4. Create an action connection for your button by dragging the button to the code editor.

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Android app

1. In Android Studio, in design mode, open the layout of the page that you want to add the app-to-app account linking button to.
2. From the palette of options, drag and drop a new button into your layout.
3. Define an ID for your button.
4. In the code for your page, initialize your app-to-app account linking button and define its onClick listener behavior to start the flow, similar to the following example.

class AppToAppFragment : Fragment() {

  private lateinit var appToAppButton: Button
    
  override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
    ): View? {
      val root = inflater.inflate(R.layout.appToAppPage, container, false)
      initComponents(root)

      appToAppButton.setOnClickListener {
        doAppToApp() 
      }
  }

  private fun initComponents(root: View) {
    appToAppButton = root.findViewById(R.id.appToAppAccountLinkingButton)
  }
}