## Summary
- Add `trackCustomPaywallImpression` API to the Unity SDK, wiring
through the existing hybrid-common bridge on both iOS and Android
- Introduce `CustomPaywallImpressionParams` class with an optional
`PaywallId`
- Pass `CustomPaywallImpressionParams` through the wrapper interface,
splitting into separate arguments only at the native bridge boundary
- Add a testing UI in the Subtester app's Paywall screen with an
optional paywall ID field

## Changes
- **New file:** `CustomPaywallImpressionParams.cs` — params class with
optional `PaywallId`
- **Interface:** `IPurchasesWrapper` — added
`TrackCustomPaywallImpression(CustomPaywallImpressionParams)`
- **Public API:** `Purchases.cs` — two overloads (with params,
parameterless)
- **iOS bridge:** `PurchasesWrapperiOS.cs` + `PurchasesUnityHelper.m` —
DllImport and ObjC bridge calling `[RCCommonFunctionality
trackCustomPaywallImpression:]`
- **Android bridge:** `PurchasesWrapperAndroid.cs` +
`PurchasesWrapper.java` — CallPurchases and static method calling
`CommonKt.trackCustomPaywallImpression()`
- **No-op:** `PurchasesWrapperNoop.cs` — empty stub
- **API tests:** `PurchasesAPITests.cs` — compile-time verification of
both overloads
- **Subtester:** `PaywallScreen.cs` — "Custom Paywall Events" section
with paywall ID field and button

### Related PRs
- purchases-ios: RevenueCat/purchases-ios#6427
- purchases-android:
RevenueCat/purchases-android#3199
- purchases-hybrid-common:
RevenueCat/purchases-hybrid-common#1537
- react-native-purchases:
RevenueCat/react-native-purchases#1660
- purchases-flutter:
RevenueCat/purchases-flutter#1679
- purchases-capacitor:
RevenueCat/purchases-capacitor#725

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Rick van der Linden <rick.vanderlinden@revenuecat.com>

## Summary
- Add `trackCustomPaywallImpression` API to React Native, enabling
developers to track impressions of custom (non-RevenueCat) paywalls for
analytics
- Add purchase tester demo screen for testing custom paywall impressions

## Changes
- **iOS bridge:** `RCT_EXPORT_METHOD(trackCustomPaywallImpression:)` in
`RNPurchases.m`
- **Android bridge:** `@ReactMethod trackCustomPaywallImpression` in
`RNPurchasesModule.java`
- **TypeScript:** `Purchases.trackCustomPaywallImpression()` in
`purchases.ts` with optional `paywallId` parameter
- **Purchase tester:** Added a demo Custom Paywall screen for testing
impressions

### Related PRs
- purchases-ios: RevenueCat/purchases-ios#6427
- purchases-android:
RevenueCat/purchases-android#3199
- purchases-hybrid-common:
RevenueCat/purchases-hybrid-common#1537
- purchases-flutter:
RevenueCat/purchases-flutter#1679
- purchases-capacitor:
RevenueCat/purchases-capacitor#725

## Summary
- Expose `trackCustomPaywallImpression` as a public API in Flutter
- Support optional `paywallId` and `offeringId` parameters via
`CustomPaywallImpressionParams`
- If `offeringId` is not provided, the SDK uses the current offering
identifier from the cache
- Pass full arguments dictionary to PHC on both iOS and Android instead
of unpacking individual fields
- Add purchase tester screen with text fields for paywall ID and
offering ID

## Changes
- **Dart:** `CustomPaywallImpressionParams` with `paywallId` and
`offeringId`
- **iOS bridge:** Pass arguments dictionary directly to
`[RCCommonFunctionality trackCustomPaywallImpression:]`
- **Android bridge:** Pass arguments map directly to
`CommonKt.trackCustomPaywallImpression()`
- **Tests:** Unit tests for all parameter combinations
- **API tester:** Compile-time verification of all API shapes
- **Purchase tester:** Screen with text fields for paywall ID and
offering ID

### Related PRs
- purchases-hybrid-common:
RevenueCat/purchases-hybrid-common#1565
- react-native-purchases:
RevenueCat/react-native-purchases#1679
- purchases-unity:
RevenueCat/purchases-unity#869
- purchases-capacitor:
RevenueCat/purchases-capacitor#725

**This is an automatic release.**

## RevenueCat SDK
### ✨ New Features
* Add platform-specific PaywallPresentationConfiguration to
purchases-capacitor-ui (#730) via Jeffrey Bunn (@Jethro87)
* Add trackCustomPaywallImpression API with offeringId override (#725)
via Rick (@rickvdl)
### 📦 Dependency Updates
* [AUTOMATIC BUMP] Updates purchases-hybrid-common to 17.52.0 (#732) via
RevenueCat Git Bot (@RCGitBot)
* [Android
9.26.1](https://github.com/RevenueCat/purchases-android/releases/tag/9.26.1)
* [Android
9.26.0](https://github.com/RevenueCat/purchases-android/releases/tag/9.26.0)
* [iOS
5.65.0](https://github.com/RevenueCat/purchases-ios/releases/tag/5.65.0)
* [iOS
5.64.0](https://github.com/RevenueCat/purchases-ios/releases/tag/5.64.0)
* Updates purchases-hybrid-common to 17.51.1 (#729) via RevenueCat Git
Bot (@RCGitBot)
* [Android
9.26.1](https://github.com/RevenueCat/purchases-android/releases/tag/9.26.1)
* [Android
9.26.0](https://github.com/RevenueCat/purchases-android/releases/tag/9.26.0)
* [iOS
5.65.0](https://github.com/RevenueCat/purchases-ios/releases/tag/5.65.0)
* [iOS
5.64.0](https://github.com/RevenueCat/purchases-ios/releases/tag/5.64.0)
* [AUTOMATIC BUMP] Updates purchases-hybrid-common to 17.49.0 (#724) via
RevenueCat Git Bot (@RCGitBot)
* [Android
9.26.1](https://github.com/RevenueCat/purchases-android/releases/tag/9.26.1)
* [Android
9.26.0](https://github.com/RevenueCat/purchases-android/releases/tag/9.26.0)
* [iOS
5.65.0](https://github.com/RevenueCat/purchases-ios/releases/tag/5.65.0)
* [iOS
5.64.0](https://github.com/RevenueCat/purchases-ios/releases/tag/5.64.0)
* [AUTOMATIC BUMP] Updates purchases-hybrid-common to 17.48.0 (#722) via
RevenueCat Git Bot (@RCGitBot)
* [Android
9.26.1](https://github.com/RevenueCat/purchases-android/releases/tag/9.26.1)
* [Android
9.26.0](https://github.com/RevenueCat/purchases-android/releases/tag/9.26.0)
* [iOS
5.65.0](https://github.com/RevenueCat/purchases-ios/releases/tag/5.65.0)
* [iOS
5.64.0](https://github.com/RevenueCat/purchases-ios/releases/tag/5.64.0)

## RevenueCatUI SDK
### Paywallv2
#### ✨ New Features
* Add customVariables support to purchases-capacitor-ui (#734) via
Facundo Menzella (@facumenzella)

### 🔄 Other Changes
* Add docs for new Paywall presentation APIs (#733) via Toni Rico
(@tonidero)
* Bump fastlane-plugin-revenuecat_internal from `3e8c384` to `9a6911b`
(#731) via dependabot[bot] (@dependabot[bot])
* Add api-extractor for public API surface tracking (#723) via Rick
(@rickvdl)
* Bump fastlane-plugin-revenuecat_internal from `e146447` to `3e8c384`
(#726) via dependabot[bot] (@dependabot[bot])
* Add Galaxy to the README (#721) via Will Taylor (@fire-at-will)