revenuecat-customer-center: add the RevenueCat Customer Center

Use this skill when the user wants an out of the box UI that lets their customers manage active subscriptions, request refunds, cancel, restore, or contact support, without shipping custom UI. The UI is configured in the RevenueCat dashboard and rendered by the RevenueCatUI SDKs.

Prerequisite: integrate-revenuecat has already run. Purchases.configure(…) must succeed before the Customer Center can load customer data.

1. Detect the platform

Inspect the working directory and pick the first match, from top to bottom:

1. React Native: package.json has a react-native-purchases entry, or react-native as a dependency. The Customer Center ships in react-native-purchases-ui. Read platforms/react-native.md. If expo is also a dependency, note it as an Expo project.
2. Flutter: pubspec.yaml exists at the project root. The Customer Center ships in purchases_ui_flutter. Read platforms/flutter.md.
3. Kotlin Multiplatform: build.gradle.kts has a kotlin { … } multiplatform block, or depends on com.revenuecat.purchases:purchases-kmp*. The Customer Center composable is in purchases-kmp-ui. Read platforms/kmp.md.
4. Android (native): build.gradle(.kts) applies com.android.application (and is not KMP). The Customer Center composable is in com.revenuecat.purchases:purchases-ui. Read platforms/android.md.
5. iOS (native): Package.swift, *.xcodeproj, *.xcworkspace, or Podfile at the project root. CustomerCenterView is in RevenueCatUI. Read platforms/ios.md.

If several match (e.g. an ios/ folder inside a Flutter project), pick the outermost project, the one that owns the build. If still ambiguous, ask the user which platform they want to configure.

2. Shared concepts (all platforms)

• Customer Center is a dashboard configured UI. Actions, copy, promotional offers, refund flows, cancel survey options, and support contact details are defined in the RevenueCat dashboard under Customer Center. Without configuration, the view renders a minimal default layout; users will see almost nothing useful.
• It needs an identified user with purchases to surface anything meaningful. If the user is anonymous and has never bought anything, the Customer Center renders an empty / restore only state. If the app supports login, call Purchases.logIn(userId) before opening the Customer Center.
• Customer Center is separate from paywalls. The standard pattern: expose a "Manage subscription" row in the settings screen that opens the Customer Center. Paywalls are for new purchases; the Customer Center is for existing subscribers.
• The UI owns the flow. Restore, cancel, refund, and promotional offer flows run inside the component. Listen for the lifecycle callbacks (onRestoreCompleted, onRefundRequestStarted, onManagementOptionSelected, onPromotionalOfferSucceeded, etc.) to react in app code, not to drive the flow.
• Platform availability varies. iOS has had Customer Center longest; Android, KMP, Flutter, and React Native follow. Platform files flag any gaps. Refund requests are an iOS only action because only Apple exposes in app refund requests; on Android, the "Manage subscription" option links out to the Google Play subscriptions screen.
• If the installed SDK version is older than Customer Center support, the fallback is a manual subscription management screen: show the user's active entitlements from Purchases.customerInfo(), expose a Purchases.restorePurchases() button, and link to the store's subscription management URL. Point the user to upgrade the SDK if they want the full Customer Center.

3. Implementation

Read the platform file that matches detection:

• platforms/ios.md
• platforms/android.md
• platforms/kmp.md
• platforms/flutter.md
• platforms/react-native.md

Each platform file is self contained: install command, exact snippet to present the Customer Center, and the callback shape.

4. Verify

Do not claim the integration is complete until:

1. The project builds on the target platform.
2. Sign into the app with a test user that has at least one active sandbox subscription. Trigger the code path that opens the Customer Center. The UI loads and the subscription appears in the list.
3. At least one configured action runs end to end. The simplest check: tap Restore purchases and confirm the restore completed callback fires with a non-empty customerInfo.entitlements.active map. If the dashboard has Cancel / Refund / Support actions configured, verify the corresponding callback (onManagementOptionSelected, onRefundRequestStarted, etc.) fires when the user taps through.
4. Dismissing the Customer Center fires the onDismiss callback.

If the Customer Center opens but is empty, the signed in user has no purchases, or the dashboard Customer Center section is not configured. Fix in the dashboard, reload, and retry.