API reference / Guides

Receive the result of a send: Production checklist

Production checklist

Verify the signature on the raw bytes, and reject timestamps older than 5 minutes.
Answer 2xx within 5 seconds and do the work from your own queue. A failing endpoint is paused, and events during a pause are dropped.
Deduplicate on event_id with a unique index in your database. Every try of a delivery carries the same event_id.
Keep signing secrets in a vault, not in code, and rotate one with POST /register/public/webhooks/{id}/rotate-secret. The old secret stops working at once and retries are signed with the new one, so add the new secret to DC_WEBHOOK_SECRET right away.
Treat callback_url as a hint, because anyone can post to it.

Next steps

Ringless voicemail technology delivers messages directly to voicemail inboxes. Delivery success depends on carrier compatibility, device type, and recipient settings. While designed for voicemail delivery, technical factors may affect performance. Drop Cowboy does not guarantee delivery rates or specific outcomes.

While Drop Cowboy provides tools to support compliance efforts, customers remain solely responsible for obtaining proper consent, maintaining opt-out lists, and complying with all federal and state telemarketing regulations. Consult with your legal counsel to ensure your specific use case and consent mechanisms comply with applicable laws.

This information is for educational purposes only and does not constitute legal advice. Regulations vary by jurisdiction and use case. Always consult with qualified legal counsel to ensure your specific practices comply with applicable federal and state laws.