WhatsApp Business App Message Echo
Delivers a non-billable mirror of a message sent from the WhatsApp Business app on a coexistence-enabled number. This outbound event does not open or extend the Cloud API customer service window.
This webhook uses Telnyx headers (telnyx-timestamp, telnyx-signature-ed25519) that are compatible with Standard Webhooks specification for SDK generation. Custom validation logic can map these to standard webhook-timestamp and webhook-signature equivalents. See https://github.com/standard-webhooks/standard-webhooks for details.
Headers
Unix timestamp for replay attack prevention
Unix timestamp (seconds since epoch) of when the webhook was sent - compatible with webhook-timestamp
Ed25519 signature of timestamp|payload for verification
Base64 encoded Ed25519 signature for webhook verification - compatible with webhook-signature
Payload
Response
Return an HTTP 200 to acknowledge the webhook.
Changes
Webhooks have no change history: a webhook is keyed by its event name rather than a path and method, so no recorded change can name it.