Migration from v7

This guide helps you migrate from flutter_inapp_purchase v7.x to v8.0.

Breaking Changes

oneTimePurchaseOfferDetailsAndroid is now an array

The most significant breaking change is that oneTimePurchaseOfferDetailsAndroid changed from a single object to an array. This was necessary to support multiple discount offers per product (Google Play Billing 7.0+).

Before (v7.x):

final price = product.oneTimePurchaseOfferDetailsAndroid?.formattedPrice;

After (v8.x):

final offers = product.oneTimePurchaseOfferDetailsAndroid;
final price = offers?.isNotEmpty == true ? offers![0].formattedPrice : null;

// Or iterate through all offers
for (final offer in offers ?? []) {
  print('Offer: ${offer.offerId ?? "default"}');
  print('Price: ${offer.formattedPrice}');

  // Check for discount info
  if (offer.discountDisplayInfo != null) {
    print('Discount: ${offer.discountDisplayInfo!.percentageDiscount}% off');
  }
}

verifyPurchase API changed

The verification APIs now use platform-specific options objects instead of the deprecated sku and androidOptions parameters.

Before (v7.x):

// iOS
final result = await iap.verifyPurchase(sku: 'product_id');

// Android
final result = await iap.verifyPurchase(
  sku: 'product_id',
  androidOptions: VerifyPurchaseAndroidOptions(
    accessToken: 'token',
    packageName: 'com.your.app',
    productToken: 'purchase_token',
  ),
);

After (v8.x):

// iOS - use apple options
final result = await iap.verifyPurchase(
  apple: VerifyPurchaseAppleOptions(sku: 'product_id'),
);

// Android - use google options
final result = await iap.verifyPurchase(
  google: VerifyPurchaseGoogleOptions(
    sku: 'product_id',
    accessToken: 'your-oauth-token',  // From your backend
    packageName: 'com.your.app',
    purchaseToken: purchase.purchaseToken,
  ),
);

// Meta Horizon (Quest) - use horizon options
final result = await iap.verifyPurchase(
  horizon: VerifyPurchaseHorizonOptions(
    sku: 'product_id',
    accessToken: 'your-meta-token',
    userId: 'user_id',
  ),
);

Note: The same change applies to validateReceipt and validateReceiptIOS.

Deprecated APIs

Alternative Billing APIs

The Alternative Billing APIs are deprecated in favor of the new Billing Programs API:

Deprecated	Replacement
checkAlternativeBillingAvailabilityAndroid()	isBillingProgramAvailableAndroid(BillingProgramAndroid.ExternalOffer)
showAlternativeBillingDialogAndroid()	launchExternalLinkAndroid()
createAlternativeBillingTokenAndroid()	createBillingProgramReportingDetailsAndroid(BillingProgramAndroid.ExternalOffer)

Before (v7.x):

final available = await iap.checkAlternativeBillingAvailabilityAndroid();
if (available) {
  await iap.showAlternativeBillingDialogAndroid();
  final token = await iap.createAlternativeBillingTokenAndroid();
}

After (v8.x):

final result = await iap.isBillingProgramAvailableAndroid(
  BillingProgramAndroid.ExternalOffer,
);

if (result.isAvailable) {
  await iap.launchExternalLinkAndroid(
    LaunchExternalLinkParamsAndroid(
      billingProgram: BillingProgramAndroid.ExternalOffer,
      launchMode: ExternalLinkLaunchModeAndroid.LaunchInExternalBrowserOrApp,
      linkType: ExternalLinkTypeAndroid.LinkToDigitalContentOffer,
      linkUri: 'https://your-payment-site.com/purchase',
    ),
  );

  final details = await iap.createBillingProgramReportingDetailsAndroid(
    BillingProgramAndroid.ExternalOffer,
  );
  // Use details.externalTransactionToken
}

New Features

Billing Programs API

The new Billing Programs API provides three methods:

• isBillingProgramAvailableAndroid(program) - Check if a billing program is available
• launchExternalLinkAndroid(params) - Launch external link for billing programs
• createBillingProgramReportingDetailsAndroid(program) - Get external transaction token

See Billing Programs Guide for detailed usage.

One-Time Product Discount Fields

New fields are available in ProductAndroidOneTimePurchaseOfferDetail:

• offerId - Unique offer identifier
• fullPriceMicros - Full (non-discounted) price
• discountDisplayInfo - Contains percentageDiscount and discountAmount
• limitedQuantityInfo - Maximum and remaining quantity
• validTimeWindow - Offer start and end times
• offerTags - List of tags for the offer
• offerToken - Token for purchase requests
• preorderDetailsAndroid - Pre-order release dates (Android 8.0+)
• rentalDetailsAndroid - Rental period info (Android 8.0+)

Purchase Suspension Status

Check if a subscription is suspended due to payment issues:

final purchases = await iap.getAvailablePurchases();

for (final purchase in purchases) {
  if (purchase is PurchaseAndroid && purchase.isSuspendedAndroid == true) {
    // Do NOT grant entitlements for suspended subscriptions
    // Direct user to fix payment method
  }
}

Dependencies Update

Update your pubspec.yaml:

dependencies:
  flutter_inapp_purchase: ^8.0.0

The plugin automatically uses:

• openiap-apple: 1.3.2
• openiap-google: 1.3.14
• openiap-gql: 1.3.4