## Installation
> npm install @acme/sdk or yarn add @acme/sdk. Requires Node 18+. TypeScript definitions included.
## Authentication
> Use API keys for server-side, OAuth for client apps. Keys are scoped per environment (dev/staging/prod).
## Rate Limits
> Free: 100 req/min, Pro: 1000 req/min, Enterprise: unlimited. Headers include remaining quota.
## Webhooks
> Configure endpoints in dashboard. We retry 3x with exponential backoff. HMAC signatures for verification.
## SDKs Available
> Official: JavaScript, Python, Go, Ruby. Community: PHP, Java, Rust. All open source on GitHub.
## Support Channels
> GitHub Issues for bugs, Discord for community help, Email for billing. Enterprise gets Slack Connect.