Send your first alert in five minutes.

Open the dashboard, create a connection and scan the QR code from WhatsApp → Linked devices.

Set your API key in the request’s Authorization header. Keep it server-side and never expose it in browser code.

curl -X POST https://api.chatrail.dev/v1/messages/text \
  -H 'Authorization: Bearer $CHATRAIL_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"connection":"sandbox","to":"15551234567","body":"A 2-bed just came up.","context":{"listing_id":"HF-2048"}}'

Verify the signature, store the event id for idempotency, then use message.received to continue the conversation.