feat: sync with openiap v1.3.15

[hyochan]

Summary

• Sync with OpenIAP v1.3.15 (gql: 1.3.15, google: 1.3.26, apple: 1.3.13)
• Simplified input field names for Android request props (per OpenIAP naming convention)
• Added offerToken support for one-time purchase discounts (Android 7.0+)

Changes

Field Name Simplification

Input fields in Android-specific request props now use simplified names (without redundant Android suffix):

Old Name	New Name
obfuscatedAccountIdAndroid	obfuscatedAccountId
obfuscatedProfileIdAndroid	obfuscatedProfileId
purchaseTokenAndroid	purchaseToken
replacementModeAndroid	replacementMode

New Feature: One-Time Purchase Discounts

Added offerToken field to RequestPurchaseAndroidProps for applying discounts to one-time (non-subscription) purchases (Android 7.0+).

Files Changed

• openiap-versions.json - Updated version tracking
• lib/types.dart - Regenerated with new field names
• lib/flutter_inapp_purchase.dart - Updated to pass new field names to native
• lib/builders.dart - Updated builder classes with new field names
• android/.../AndroidInappPurchasePlugin.kt - Updated native code to handle new fields
• test/builders_unit_test.dart - Updated tests
• test/flutter_inapp_purchase_channel_test.dart - Updated tests
• docs/blog/2026-01-20-8.2.3.release.md - Added release blog post

Test Plan

• flutter analyze passes
• flutter test passes (198 tests)
• Blog post created

OpenIAP Versions

Package	Previous	Current
openiap-gql	1.3.14	1.3.15
openiap-google	1.3.25	1.3.26
openiap-apple	1.3.12	1.3.13

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added support for one-time purchase discounts on Android 7.0+ using offer tokens

• Breaking Changes

  • Simplified Android field names by removing "Android" suffixes across purchase and subscription configurations; migration guide included in documentation

• Dependencies

  • Updated underlying billing library versions for improved Google Play integration

• Documentation

  • Added comprehensive release notes with field migration examples and builder usage updates

_{✏️ Tip: You can customize this high-level summary in your review settings.}

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📥 Commits

Reviewing files that changed from the base of the PR and between f445a58 and 867918b.

📒 Files selected for processing (3)

• android/src/main/kotlin/io/github/hyochan/flutter_inapp_purchase/AndroidInappPurchasePlugin.kt
• docs/static/llms-full.txt
• example/lib/src/screens/builder_demo_screen.dart

📝 Walkthrough

Walkthrough

Renames Android-specific field suffixes to simplified generic names (purchaseTokenAndroid → purchaseToken, obfuscatedAccountIdAndroid → obfuscatedAccountId, etc.) and adds offerToken support for one-time purchase discounts on Android 7.0+ across native plugins, type definitions, builders, and related tests while maintaining backward compatibility.

Changes

Cohort / File(s)	Summary
Android Native Plugin android/src/main/kotlin/io/github/hyochan/flutter_inapp_purchase/AndroidInappPurchasePlugin.kt	Renames input/output field keys and parameter names (purchaseTokenAndroid → purchaseToken, replacementModeAndroid → replacementMode, obfuscatedAccountIdAndroid → obfuscatedAccountId, obfuscatedProfileIdAndroid → obfuscatedProfileId). Updates input parsing to accept both legacy Android-suffixed and new simplified keys. Adds offerToken support in buildRequestPurchaseProps and wires it to OpenIAP props for InApp purchases. Updates internal constants.
Public Type Definitions lib/types.dart	Updates RequestPurchaseAndroidProps and RequestSubscriptionAndroidProps field declarations from Android-suffixed to simplified names. Adds new optional offerToken field to RequestPurchaseAndroidProps. Updates JSON serialization (fromJson/toJson) to read/write new field names and offerToken.
Purchase Flow Builders lib/builders.dart	Updates RequestPurchaseAndroidBuilder and RequestSubscriptionAndroidBuilder with renamed fields and adds new offerToken field to RequestPurchaseAndroidBuilder. Updates build() mappings to propagate renamed fields and offerToken into RequestPurchaseAndroidProps and RequestSubscriptionAndroidProps.
Flutter Channel Implementation lib/flutter_inapp_purchase.dart	Updates purchase payload construction to use simplified field names instead of Android-suffixed variants. Adds conditional payload entry for offerToken (Android 7.0+). Ensures offerToken is null for subscription paths.
Dependency Management openiap-versions.json	Updates OpenIAP package versions: google 1.3.25 → 1.3.26, gql 1.3.14 → 1.3.15.
Documentation docs/blog/2026-01-20-8.2.3.release.md	Release notes for v8.2.3 documenting one-time purchase discounts via offerToken, migration guide for simplified field naming, updated builder examples, field change tables, and updated dependency references.
Unit Tests test/builders_unit_test.dart, test/flutter_inapp_purchase_channel_test.dart	Updates test expectations and assertions to reference renamed fields in RequestPurchaseAndroidBuilder and RequestSubscriptionAndroidBuilder. Adds offerToken test coverage for purchase builder. Updates payload assertions to reflect new field names.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• #603: Both PRs modify AndroidInappPurchasePlugin.kt's buildRequestPurchaseProps to extend Android purchase payload fields (offerToken addition and field renaming)
• #555: Both PRs modify AndroidInappPurchasePlugin.kt and the Android purchase request flow with offerToken and purchase payload field changes

Suggested labels

$ openiap, 🎯 feature, 🤖 android, :package: update packages, 🚚 migration

Poem

🐰 Fields simplified, no more suffixes to name,
offerToken hops in to join the game,
From Android-specific to generic so clean,
The best purchase flow we've ever seen!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main objective of syncing with OpenIAP v1.3.15, which is the primary purpose of this changeset including version updates, field renaming, and new offerToken support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[codecov]

Codecov Report

❌ Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.17%. Comparing base (a17c28e) to head (867918b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/flutter_inapp_purchase.dart	40.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #610      +/-   ##
==========================================
- Coverage   67.28%   67.17%   -0.12%     
==========================================
  Files           7        7              
  Lines        1446     1447       +1     
==========================================
- Hits          973      972       -1     
- Misses        473      475       +2     

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[coderabbitai]

Actionable comments posted: 0

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

android/src/main/kotlin/io/github/hyochan/flutter_inapp_purchase/AndroidInappPurchasePlugin.kt (1)

932-941: Fix named-argument mismatch in function call.
Lines 939-940 use purchaseTokenAndroid and replacementModeAndroid, which do not exist as parameters in buildRequestPurchaseProps. The function signature defines purchaseToken and replacementMode. This will cause a Kotlin compilation error.

Fix

                         val requestProps = buildRequestPurchaseProps(
                             type = purchaseType,
                             skus = skus,
                             obfuscatedAccountId = obfuscatedAccountId,
                             obfuscatedProfileId = obfuscatedProfileId,
                             isOfferPersonalized = isOfferPersonalized,
                             subscriptionOffers = emptyList(),
-                            purchaseTokenAndroid = null,
-                            replacementModeAndroid = null
+                            purchaseToken = null,
+                            replacementMode = null
                         )