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Buy on StoreKit and Play Billing, then confirm with the backend (#78) (#122)
## Summary
- The Capacitor shell buys through StoreKit (iOS 15) and Play Billing instead of RevenueCat.
- After the store sheet succeeds, the app POSTs the signed transaction or Play purchase token to `/monetization/store/confirm/`.
- Restore reads current store entitlements and confirms each one. Web checkout stays on Stripe.
- The store account token from `GET /monetization/subscription/` is sent as `appAccountToken` / `obfuscatedAccountId`.

Depends on the `chat_backend` PR for issue #78 (`feat/78-native-store-purchases`).

## Test plan
- [x] `storeBilling`, `revenueCat`, `finance`, and `BillingSection` unit tests
- [ ] iOS sandbox purchase and restore against a backend with `APPLE_IAP_BUNDLE_ID` set
- [ ] Play license-test purchase and restore against a backend with `GOOGLE_PLAY_SERVICE_ACCOUNT_JSON` set
- [ ] Web billing still opens Stripe Checkout

Reviewed-on: #122
2026-10-19 04:38:43 -07:00

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Markdown

# Monetization (web Stripe + native store billing)
## Channels
| Runtime | Checkout / manage | Ledger |
|---------|-------------------|--------|
| Web (`!isNativePlatform`) | Stripe Checkout + Customer Portal via `/monetization/...` | Stripe webhooks |
| Native Capacitor | StoreKit (iOS) and Play Billing (Android) | `POST /monetization/store/confirm/` verifies the store transaction and writes the same invoice/payment tables |
There is no App Store, Play, or RevenueCat webhook. After the store sheet succeeds, the app sends the signed StoreKit transaction or the Play purchase token. The backend checks it before granting access. Renewals and restores send the current store entitlement again. Access ends when the verified period end passes.
FE displays whatever `/monetization/invoices/` (and subscription) returns after refresh. Provider badge uses `provider` (`app_store`, `play_store`, or legacy `revenuecat`) plus `revenuecat_store`.
## Store account token
`GET /monetization/subscription/` returns `store_account_token`. The native purchase passes that value as StoreKit `appAccountToken` and Play Billing `obfuscatedAccountId`. The backend rejects a token that belongs to a different user, and rejects a transaction already linked to another account.
Plan rows expose `store_product_id` (the store product identifier). Configure it on `SubscriptionPlan.revenuecat_product_id`, or set `REVENUECAT_PRODUCT_PLAN_MAP` so a product id maps to a plan slug.
## Related
- Backend issue #78
- [`ANDROID.md`](ANDROID.md) / [`IOS.md`](IOS.md) for store builds