#8906 feat(library): How to Build a Stripe Billing and Failed-Payment AI Agent

Summary

• Add a Stripe billing guide and cover image for failed-payment classification, alerts, and approval.
• Document the Stripe Webhook trigger, event selection, signing secret, deployment, and Stripe retrieval operations with invoice-ID mapping.
• Keep payment and retry policy in Stripe and describe Sim's capabilities without superlatives.

Type of Change

• Feature

Testing

• bun run lint
• bun run type-check
• bun run check:audits
• bun run test
• Block-registry audit and focused library-content audit

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)