If you’ve customized a flow or paywall using the builder, you don’t need to worry about rendering it in your mobile app code to display it to the user. Such a flow or paywall contains both what should be shown and how it should be shown.

Before you start presenting flows (Click to Expand)

1. Set up initial integration of Adapty with the App Store and with Google Play.
2. Install and configure Adapty SDK. Make sure to set the observerMode parameter to true. Refer to the Flutter SDK installation guide.
3. Create products in the Adapty Dashboard.
4. Configure flows or paywalls in the builders and assign products to them.
5. Create placements and assign your flows or paywalls to them.
6. Fetch flows and their configuration in your mobile app code.

In Observer mode, the SDK does not make purchases for you. When a user taps the purchase or restore button in an Adapty-rendered flow or paywall, the SDK calls your AdaptyUIObserverModeResolver instead — perform the purchase or restore with your own code there.

1. Implement the AdaptyUIObserverModeResolver:

   class MyObserverModeResolver extends AdaptyUIObserverModeResolver {
     @override
     void observerModeDidInitiatePurchase(
       AdaptyUIFlowView view,
       AdaptyPaywallProduct product,
       void Function() onStartPurchase,
       void Function() onFinishPurchase,
     ) {
       onStartPurchase(); // the view shows its loading indicator
       // make the purchase with your own code, then:
       onFinishPurchase(); // the view hides the loading indicator
     }
   
     @override
     void observerModeDidInitiateRestore(
       AdaptyUIFlowView view,
       void Function() onStartRestore,
       void Function() onFinishRestore,
     ) {
       onStartRestore();
       // restore purchases with your own code, then:
       onFinishRestore();
     }
   }

   The observerModeDidInitiatePurchase method informs you that the user has initiated a purchase, and observerModeDidInitiateRestore — that the user has initiated a restore. Trigger your custom purchase or restore flow in response.

   Also, remember to invoke the following callbacks to notify AdaptyUI about the process of the purchase or restore. This is necessary for proper flow behavior, such as showing the loader, among other things:

   Callback	Description
   onStartPurchase()	The callback should be invoked to notify AdaptyUI that the purchase is started.
   onFinishPurchase()	The callback should be invoked to notify AdaptyUI that the purchase is finished.
   onStartRestore()	The callback should be invoked to notify AdaptyUI that the restore is started.
   onFinishRestore()	The callback should be invoked to notify AdaptyUI that the restore is finished.

2. Register the resolver before presenting any screen:

   AdaptyUI().setObserverModeResolver(MyObserverModeResolver());

3. Create and present the flow view as usual: fetch the flow and create its view, then present it. No extra parameters are needed — once the resolver is registered, every Adapty-rendered flow or paywall routes purchases and restores through it.