Stellar Webhook Event System

[Timrossid]

Description

Build a webhook delivery system that notifies merchants about Stellar payment events including payment received, confirmed, failed, and settlement completed.

Stellar Documentation

• https://developers.stellar.org/docs/encyclopedia/listening-streams
• https://developers.stellar.org/api/horizon/streaming

Acceptance Criteria

• Webhook event types: payment.received, payment.confirmed, payment.failed, settlement.completed
• POST JSON payload to merchant webhook URL
• Include HMAC-SHA256 signature header (x-webhook-signature)
• Retry mechanism: 3 retries with exponential backoff (10s, 30s, 60s)
• Webhook delivery logs (status, response, timestamp)
• Manual webhook replay from dashboard
• Webhook secret rotation support
• IP whitelist for webhook origins
• Payload includes full Stellar transaction details
• Timeout: 10 seconds per webhook call