ProductSubscriptionIOS.subscriptionOffers is always null

[FeanorD]

🚨 MANDATORY PRE-SUBMISSION CHECKLIST

✅ Checklist

• Have you run the example/ project?
  • Most usage patterns are demonstrated in the example
  • Example path: /example/lib/main.dart
  • Did you reference the example code for your implementation?
• Have you read the README documentation?
• Have you searched existing issues for similar questions?

📱 Example Project Reference

Example Code Review

• I've checked the example's initialization code
• I've checked the example's purchase flow
• I've checked the example's error handling
• I've implemented the same as the example but it doesn't work

❓ Your Question

What would you like to know? Please be specific.

In ProductSubscriptionIOS implementation, the documentation comments say that discountsIOS is deprecated and subscriptionOffers should be used instead.

💻 Current Code

/lib/types.dart

...
/// @deprecated Use subscriptionOffers instead for cross-platform compatibility.
  final List<DiscountIOS>? discountsIOS;
...
/// @deprecated Use subscriptionOffers instead for cross-platform compatibility.
  final SubscriptionInfoIOS? subscriptionInfoIOS;

However, in parseProductFromNative() implementation, the subscriptionInfoIOS is missing in ProductSubscriptionIOS instantiation.

/lib/flutter_inapp_purchase.dart

gentype.ProductCommon parseProductFromNative(
  Map<String, dynamic> json,
  String type, {
  required bool fallbackIsIOS,
}) {
...

  if (productType == gentype.ProductType.Subs) {
    if (platform == gentype.IapPlatform.IOS) {
      return gentype.ProductSubscriptionIOS(
        currency: currency,
        description: description,
        displayNameIOS: json['displayNameIOS']?.toString() ?? title,
        displayPrice: displayPrice,
        id: productId,
        isFamilyShareableIOS: json['isFamilyShareableIOS'] as bool? ?? false,
        jsonRepresentationIOS:
            json['jsonRepresentationIOS']?.toString() ?? '{}',
        platform: platform,
        title: title,
        type: productType,
        typeIOS: _parseProductTypeIOS(json['typeIOS']?.toString()),
        debugDescription: json['debugDescription']?.toString(),
        // Only discountsIOS is provided
        discountsIOS: _parseDiscountsIOS(
          json['discountsIOS'] ?? json['discounts'],
        ),
        displayName: json['displayName']?.toString(),
        introductoryPriceAsAmountIOS:
            json['introductoryPriceAsAmountIOS']?.toString(),
        introductoryPriceIOS: json['introductoryPriceIOS']?.toString(),
        introductoryPriceNumberOfPeriodsIOS:
            json['introductoryPriceNumberOfPeriodsIOS']?.toString(),
        introductoryPricePaymentModeIOS: _parsePaymentMode(
          json['introductoryPricePaymentModeIOS'],
        ),
        introductoryPriceSubscriptionPeriodIOS: _parseSubscriptionPeriod(
          json['introductoryPriceSubscriptionPeriodIOS'],
        ),
        price: priceValue,
        subscriptionInfoIOS: _parseSubscriptionInfoIOS(
          json['subscriptionInfoIOS'] ?? json['subscription'],
        ),
        subscriptionPeriodNumberIOS:
            json['subscriptionPeriodNumberIOS']?.toString(),
        subscriptionPeriodUnitIOS: _parseSubscriptionPeriod(
          json['subscriptionPeriodUnitIOS'],
        ),
      );
    }
...
  }
...
}

// Paste your code here

📱 Environment

Package version:

• flutter_inapp_purchase: ^8.2.6

Platform:

• iOS
• Android

[hyochan]

Thanks for the detailed report! You're right - this is a bug.

Analysis

The iOS native layer (via OpenIAP) correctly returns subscriptionOffers, but the Dart parsing layer in helpers.dart doesn't map it to ProductSubscriptionIOS.

Looking at StoreKitTypesBridge.swift:94, the native code does return subscriptionOffers:

subscriptionOffers: standardizedOffers.isEmpty ? nil : standardizedOffers,

However, in helpers.dart, the subscriptionOffers field is missing from the ProductSubscriptionIOS instantiation.

Fix Required

Need to add subscriptionOffers parsing in parseProductFromNative() function in helpers.dart.

I'll prepare a fix for this.

[hyochan]

Released 8.2.7

[FeanorD]

@hyochan Awesome! Many thanks for this lightning-fast fix!