Handle flow & paywall events - Capacitor

Flows and paywalls built with the Flow Builder don’t need extra code to make and restore purchases. However, they generate some events that your app can respond to. Those events include button presses (close buttons, URLs, product selections, and so on) as well as notifications on purchase-related actions taken on the flow. Learn how to respond to these events below.

To control or monitor processes occurring on the flow screen within your mobile app, implement the view.setEventHandlers method:

import { adapty, createFlowView } from '@adapty/capacitor';

const view = await createFlowView(flow);

const unsubscribe = await view.setEventHandlers({
  onCloseButtonPress() {
    return true; // close the flow (default behavior)
  },
  onAndroidSystemBack() {
    return true; // close the flow; by default, it stays open
  },
  onPurchaseCompleted(purchaseResult, product) {
    return purchaseResult.type === 'success'; // close the flow on a successful purchase, keep it open for cancelled or pending purchases
  },
  onPurchaseStarted(product) { /***/ },
  onPurchaseFailed(error, product) { /***/ },
  onRestoreCompleted(profile) { /***/ },
  onRestoreFailed(error) { /***/ },
  onProductSelected(productId) { /***/ },
  onError(error) { /***/ },
  onLoadingProductsFailed(error) { /***/ },
  onUrlPress(url, openIn) {
    adapty.openWebUrl({ url, openIn }).catch(console.warn); // same as the SDK default
    return false; // keep the flow open
  },
  onAppeared() { /***/ },
  onDisappeared() { /***/ },
  onWebPaymentNavigationFinished() { /***/ },
});

// onUrlPress
url;    // 'https://example.com/terms'
openIn; // 'browser_in_app' or 'browser_out_app'

// onCustomAction
actionId; // 'login'

// onProductSelected
productId; // 'premium_monthly'

// onPurchaseStarted, onPurchaseCompleted, onPurchaseFailed
product.vendorProductId;        // 'premium_monthly'
product.localizedTitle;         // 'Premium Monthly'
product.localizedDescription;   // 'Premium subscription for 1 month'
product.price?.amount;          // 9.99
product.price?.currencyCode;    // 'USD'
product.price?.localizedString; // '$9.99'

// onPurchaseCompleted
purchaseResult.type; // 'success', 'pending', or 'user_cancelled'
if (purchaseResult.type === 'success') {
  purchaseResult.profile.accessLevels['premium']?.isActive; // true
}

// onRestoreCompleted
profile.accessLevels['premium']?.isActive; // true

// onPurchaseFailed, onRestoreFailed, onError, onLoadingProductsFailed
error.message; // 'Purchase failed due to insufficient funds'

You can register event handlers you need, and miss those you do not need. In this case, unused event listeners would not be created. There are no required event handlers.

Event handlers return a boolean. If true is returned, the displaying process is considered complete, thus the flow screen closes and event listeners for this view are removed.

Some event handlers have a default behavior that you can override if needed:

• onCloseButtonPress: closes the flow when the close button is pressed.
• onUrlPress: opens the tapped URL in the native browser via adapty.openWebUrl, honoring the Open in option set in the builder, and keeps the flow open.
• onAndroidSystemBack: keeps the flow open when the Back button is pressed. Return true to close it.
• onPurchaseCompleted: keeps the flow open after a purchase completes. Return true to close it.
• onRestoreCompleted: keeps the flow open after a successful restore. Return true to close it.
• onError: closes the flow if its rendering fails.

Event handlers

Handle purchases in observer mode

If you activated the SDK in Observer mode (observerMode: true) and present an Adapty-rendered flow, the SDK does not make purchases for you. When a user taps the purchase or restore button, the SDK invokes onObserverPurchaseInitiated or onObserverRestoreInitiated instead, so you can perform the purchase or restore with your own code. See Present flows in Observer mode for the full setup.

Paywalls configured with the Paywall Builder don’t need extra code to make and restore purchases. However, they generate some events that your app can respond to. Those events include button presses (close buttons, URLs, product selections, and so on) as well as notifications on purchase-related actions taken on the paywall. Learn how to respond to these events below.

To control or monitor processes occurring on the paywall screen within your mobile app, implement the view.setEventHandlers method:

import { adapty, createPaywallView } from '@adapty/capacitor';

const view = await createPaywallView(paywall);

const unsubscribe = view.setEventHandlers({
  onCloseButtonPress() {
    console.log('User closed paywall');
    return true; // Allow the paywall to close
  },
  onAndroidSystemBack() {
    console.log('User pressed back button');
    return true; // Allow the paywall to close
  }, 
  onAppeared() {
    console.log('Paywall appeared');
    return false; // Don't close the paywall
  }, 
  onDisappeared() {
    console.log('Paywall disappeared');
  },
  onPurchaseCompleted(purchaseResult, product) {
    console.log('Purchase completed:', purchaseResult);
    return purchaseResult.type !== 'user_cancelled'; // Close if not cancelled
  },
  onPurchaseStarted(product) {
    console.log('Purchase started:', product);
    return false; // Don't close the paywall
  },
  onPurchaseFailed(error, product) {
    console.error('Purchase failed:', error);
    return false; // Don't close the paywall
  },
  onRestoreCompleted(profile) {
    console.log('Restore completed:', profile);
    return true; // Close the paywall after successful restore
  },
  onRestoreFailed(error) {
    console.error('Restore failed:', error);
    return false; // Don't close the paywall
  },
  onProductSelected(productId) {
    console.log('Product selected:', productId);
    return false; // Don't close the paywall
  },
  onRenderingFailed(error) {
    console.error('Rendering failed:', error);
    return false; // Don't close the paywall
  },
  onLoadingProductsFailed(error) {
    console.error('Loading products failed:', error);
    return false; // Don't close the paywall
  },
  onUrlPress(url) {
    window.open(url, '_blank');
    return false; // Don't close the paywall
  },
});

// onCloseButtonPress
{
  "event": "close_button_press"
}

// onAndroidSystemBack
{
  "event": "android_system_back"
}

// onAppeared
{
  "event": "paywall_shown"
}

// onDisappeared
{
  "event": "paywall_closed"
}

// onUrlPress
{
  "event": "url_press",
  "url": "https://example.com/terms"
}

// onCustomAction
{
  "event": "custom_action",
  "actionId": "login"
}

// onProductSelected
{
  "event": "product_selected",
  "productId": "premium_monthly"
}

// onPurchaseStarted
{
  "event": "purchase_started",
  "product": {
    "vendorProductId": "premium_monthly",
    "localizedTitle": "Premium Monthly",
    "localizedDescription": "Premium subscription for 1 month",
    "localizedPrice": "$9.99",
    "price": 9.99,
    "currencyCode": "USD"
  }
}

// onPurchaseCompleted - Success
{
  "event": "purchase_completed",
  "purchaseResult": {
    "type": "success",
    "profile": {
      "accessLevels": {
        "premium": {
          "id": "premium",
          "isActive": true,
          "expiresAt": "2024-02-15T10:30:00Z"
        }
      }
    }
  },
  "product": {
    "vendorProductId": "premium_monthly",
    "localizedTitle": "Premium Monthly",
    "localizedDescription": "Premium subscription for 1 month",
    "localizedPrice": "$9.99",
    "price": 9.99,
    "currencyCode": "USD"
  }
}

// onPurchaseCompleted - Cancelled
{
  "event": "purchase_completed",
  "purchaseResult": {
    "type": "user_cancelled"
  },
  "product": {
    "vendorProductId": "premium_monthly",
    "localizedTitle": "Premium Monthly",
    "localizedDescription": "Premium subscription for 1 month",
    "localizedPrice": "$9.99",
    "price": 9.99,
    "currencyCode": "USD"
  }
}

// onPurchaseFailed
{
  "event": "purchase_failed",
  "error": {
    "code": "purchase_failed",
    "message": "Purchase failed due to insufficient funds",
    "details": {
      "underlyingError": "Insufficient funds in account"
    }
  }
}

// onRestoreCompleted
{
  "event": "restore_completed",
  "profile": {
    "accessLevels": {
      "premium": {
        "id": "premium",
        "isActive": true,
        "expiresAt": "2024-02-15T10:30:00Z"
      }
    },
    "subscriptions": [
      {
        "vendorProductId": "premium_monthly",
        "isActive": true,
        "expiresAt": "2024-02-15T10:30:00Z"
      }
    ]
  }
}

// onRestoreFailed
{
  "event": "restore_failed",
  "error": {
    "code": "restore_failed",
    "message": "Purchase restoration failed",
    "details": {
      "underlyingError": "No previous purchases found"
    }
  }
}

// onRenderingFailed
{
  "event": "rendering_failed",
  "error": {
    "code": "rendering_failed",
    "message": "Failed to render paywall interface",
    "details": {
      "underlyingError": "Invalid paywall configuration"
    }
  }
}

// onLoadingProductsFailed
{
  "event": "loading_products_failed",
  "error": {
    "code": "products_loading_failed",
    "message": "Failed to load products from the server",
    "details": {
      "underlyingError": "Network timeout"
    }
  }
}

You can register event handlers you need, and miss those you do not need. In this case, unused event listeners would not be created. There are no required event handlers.

Event handlers return a boolean. If true is returned, the displaying process is considered complete, thus the paywall screen closes and event listeners for this view are removed.

Some event handlers have a default behavior that you can override if needed:

• onCloseButtonPress: closes paywall when close button pressed.
• onAndroidSystemBack: closes paywall when the Back button pressed.
• onRestoreCompleted: closes paywall after successful restore.
• onPurchaseCompleted: closes paywall unless user cancelled.
• onRenderingFailed: closes paywall if its rendering fails.
• onUrlPress: opens URLs in system browser and keeps paywall open.

Event handlers