# Paywall

> The paywall for your backend, designed for AI coding agents: plans, feature
> flags, pricing and payments (Stripe, Razorpay, simulated test provider) for
> consumer apps. An agent integrates it from one prompt and one app-scoped token.
> Static apps can use opt-in guest checkout with an unverified email; no consumer backend is required.
> Email authentication/recovery and drop-in paywall components are coming later.

## Integration

- [Integration guide](https://paywallhq.com/integrate.md): complete, self-contained guide
  for integrating an app — architecture, SDK downloads, code for every flow, API reference.

## Updates and SDK upgrades

- [Public changelog](https://paywallhq.com/changelog): product changes and adoption notes
- [Changelog JSON](https://paywallhq.com/changelog.json): stable release IDs, SDK revisions, integration steps, and verification cases
- [Changelog Markdown](https://paywallhq.com/changelog.md): the same changes in readable Markdown
- [Upgrade guide](https://paywallhq.com/upgrade.md): how to update an existing integration while preserving local customizations
- [SDK manifest](https://paywallhq.com/vendor/manifest.json): current revision, downloads, sizes, and SHA-256 hashes

## Pages

- [For AI agents](https://paywallhq.com/for-agents): the prompt to hand an agent and what it does with it
- [Feature flags](https://paywallhq.com/feature-flags): boolean, number and text flags granted by plan and overridden per customer
- [Frontend](https://paywallhq.com/frontend): drop-in pricing tables, paywall modals and hosted checkout (coming soon)

## SDK files (vendor these)

- [hub-server.js](https://paywallhq.com/vendor/hub-server.js): backend SDK (identify, verifyToken, checkout)
- [hub-client.js](https://paywallhq.com/vendor/hub-client.js): browser SDK (sessions, gating, checkout)
- [hub-react.js](https://paywallhq.com/vendor/hub-react.js): React hooks over hub-client.js