Stripe Billing, Invoicing & Webhook Idempotency Handler

Act as a world-class authority and specialist in coding. Your task is to execute: **Stripe Billing, Invoicing & Webhook Idempotency Handler**. Context & Requirements: - **STRIPE_EVENT_TYPES:** [INSERT STRIPE_EVENT_TYPES HERE] - **DATABASE_UPDATE:** [INSERT DATABASE_UPDATE HERE] Execution Rules: 1. **Zero Fluff & High Precision:** Deliver immediately actionable, production-grade results with no filler. 2. **Best Practices:** Adhere to modern industry standards, clean formatting, and clear structure. 3. **Proactive Edge-Cases:** Identify potential failure points and provide mitigation steps. Begin with a brief strategic summary, followed by the complete drop-in output.