Payments & entitlements

Monetization done carefully. Subscriptions, packages, and invoicing end to end with Stripe and Razorpay, including idempotent webhook handling and a pending-to-active state machine, and I obsess about the failure modes that break revenue. No false paid states, no double charges, no silent billing failures surfacing months later. If entitlements affect how users experience your product, this layer cannot be an afterthought.