Payments & Billing Engineering

Use this skill to design, implement, and debug production payment integrations: checkout flows, subscription management, webhook handling, regional pricing, feature gating, one-time purchases, billing portals, and payment testing.

Defaults bias toward: Stripe as primary processor (most common), webhooks as source of truth, idempotent handlers, lazy-initialized clients, dynamic payment methods, Zod validation at boundaries, structured logging, and fire-and-forget for non-critical tracking. For complex billing, consider a billing orchestrator (Chargebee, Recurly, Lago) on top of Stripe/Adyen.

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