Documentation Index
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Understand event names and webhook payloads.
snake_case. For example, outbound fax webhooks use outbound_fax.
{
"event_id": "evt_abc123xyz789",
"event_type": "outbound_fax",
"occurred_at": "2026-08-22T08:23:28Z",
"data": {
"fax": {
"direction": "outbound",
"fax_uuid": "XXXXXXXXXXXXXXXX",
"transmission_duration": 59,
"transmission_start": "2023-11-10T00:00:34Z",
"transmission_end": "2023-11-10T00:01:33Z",
"pages": 1,
"fax_status": "Delivered",
"from_number": "19073331000",
"to_number": "19073331000",
"transferred_pages": 1,
"retry_attempt": 0
}
}
}
data object contains one property named for the affected resource. Its value contains the fields relevant to that event. Date and timestamp fields use ISO 8601 UTC strings.
Your integration should ignore unknown fields and safely handle new event types.