Returns a WhatsApp message's lifecycle events in chronological order, one entry per delivery transition (`whatsapp.accepted`, `whatsapp.sent`, `whatsapp.delivered`, `whatsapp.read`, `whatsapp.failed`). The timeline is bounded and returned in full, so this list is not paginated; an unknown message id returns a `404`. For the message's current state in a single field, use [Get a WhatsApp message](/docs/api/reference/get-whats-app-message) instead. ID of the message (`wam_`-prefixed), as returned in the send response's `id` field. Keep only events of this exact type (for example `whatsapp.delivered` or `whatsapp.failed`). Omit for the full timeline. Timeline events for this WhatsApp message, in chronological order. The timeline is bounded and returned in full; this list is not paginated. ID of the event (`ev_`-prefixed), unique within the message's timeline. Lifecycle event type. `whatsapp.accepted`: Bird accepted the request. `whatsapp.sent`: handed to the WhatsApp network. `whatsapp.delivered`: delivery confirmed to the recipient's device. `whatsapp.read`: the recipient opened the message (this does not change the message `status`, which never becomes `read`). `whatsapp.failed`: terminal permanent failure. Open enum: new event types may be added over time, so treat any unrecognized value as a future event rather than an error. Possible values (may grow over time): `whatsapp.accepted`, `whatsapp.sent`, `whatsapp.delivered`, `whatsapp.read`, `whatsapp.failed` When this event occurred. Failure detail. Present only on `whatsapp.failed` events. Failure reason, uniform whether the failure happened internally or was reported by the WhatsApp network. `insufficient_balance`: the workspace could not afford the send. `price_not_found`: no price was configured for this destination/template combination. `internal_error`: an unexpected Bird-side failure. `undeliverable`: the recipient could not be reached (for example not on WhatsApp, or the number is invalid). `service_window_expired`: the 24-hour customer care window has closed and a free-form message cannot be sent; send a template instead. `rate_limited`: the send was throttled. `recipient_suppressed`: the recipient is on the workspace's suppression list; the message was rejected before sending. Open enum: new codes may be added over time, so treat any unrecognized value as a future code rather than an error. Possible values (may grow over time): `insufficient_balance`, `price_not_found`, `internal_error`, `undeliverable`, `service_window_expired`, `rate_limited`, `recipient_suppressed` Human-readable explanation of the failure. Raw error code from the WhatsApp Cloud API, when available, for low-level debugging. When the failure occurred.