zuraffa_subscriptions

In-app purchases and subscriptions for the Zuraffa ecosystem.

Usage

final subs = SubscriptionService();

// Fetch the catalog, launch a purchase attributed to the signed-in user,
// acknowledge it:
final products = await subs.products(['pro.monthly']);
final purchase = await subs.purchase(PurchaseRequest(
    productId: 'pro.monthly', appAccountUserId: userId));
await subs.finishPurchase(purchase);

// Gate features on derived entitlement state:
final hasPro = await subs.hasEntitlement(userId, 'pro.monthly');
final snapshot = await subs.snapshotFor(userId); // for UI/telemetry

Design

• SubscriptionStorePort — products / purchase / restore / finishPurchase; StoreKit 2 and Play Billing adapters implement it as federated siblings.
• SubscriptionService — maps store transactions into domain entitlements and re-derives state against the clock: active → gracePeriod → expired (configurable grace window, revoked preserved). Purchases are attributed to the request's appAccountUserId (transaction id fallback for anonymous purchases), so the advertised purchase→gate flow holds end to end.
• Lifecycle outcome mapping — every PurchaseState lands in a defensible EntitlementState: purchased/restored → active, pending → pending (never gates), expired → expired, revoked → revoked (preserved verbatim by clock derivation; refunds never keep features unlocked).
• InMemorySubscriptionStore — fully scriptable default store (catalog, next-outcome scripting, owned purchases, finish log).
• Entities via the zfa CLI (Zorphy): Product, Purchase, Entitlement, EntitlementSnapshot + EntitlementState/PurchaseState enums.
• Typed SubscriptionException taxonomy (cancelled / product_unavailable / store_unavailable / pending) with stable machine codes; a raised error grants nothing.

Spec & TDD

The behavioral contract is pinned by specs/001-subscription-port/spec.md and driven entirely through the zfa tdd cycle (plan → gen → verify-red → make → refactor → run → verify), with receipts, cycle log, and the unified journal under specs/001-subscription-port/tdd/.