reels-downloader × PayCraft

reels-downloader needed multi-platform subscription billing without writing 4 platform-specific paywalls (Play Billing, App Store StoreKit, Stripe Web, custom Desktop) and 2 webhook routers (Stripe + Razorpay). PayCraft delivers a single KMP BillingManager.isPremium(uid) contract that wires the same gating decision into every target.

1. Sign up at paycraft.mobilebytesensei.com, pick slug reels-downloader
2. One-click Stripe Connect OAuth — keys never typed in chat
3. Create monthly + annual products on the dashboard
4. Wire cmp-paycraft in commonMain + call PayCraft.initialize() in app start
5. Gate features with BillingManager.isPremium(uid)

The SDK is cache-first (weekly default, hourly during trial) — zero network on the happy path.

• Tenant signup creates a row in `tenants`
• Stripe Connect OAuth completes without secrets typed in chat
• Webhook signature verification (edge function logs)
• subscriptions lifecycle (created → active → canceled)
• isPremium returns true within 5s of invoice.payment_succeeded
• Trial-sticky-fields survive renewal
• RLS prevents tenant A reading tenant B's subscriptions
• Webhook idempotency (Stripe retry → same DB state)
• Refund flow (charge.refunded) downgrades subscriptions.status

The full step-by-step integration walkthrough — including DB schema snippets, webhook event payloads, anti-patterns we hit, and the monthly drill log — lives in the PayCraft repo: