Add webhook delivery system with automatic retries

We added a complete webhook delivery system to getpeppr.

Features

• Webhook endpoints — Register URLs via POST /v1/webhooks or the dashboard to receive real-time notifications
• Event filtering — Subscribe to specific events (invoice.sent, invoice.delivered, invoice.accepted, etc.)
• Automatic retries — Failed deliveries are retried with exponential backoff (1min, 5min, 30min)
• Signature verification — Every payload is signed with HMAC-SHA256 via the Getpeppr-Signature header
• Dashboard management — Create, test, and monitor webhook endpoints from the console

SDK support

const peppr = new Getpeppr({ apiKey: "..." });

// Verify incoming webhooks
const event = peppr.webhooks.verify(payload, signature, secret);

See the webhook documentation for integration details.