Service window status
Reports whether the WhatsApp 24-hour customer-service window is currently OPEN for a contact on the number bound to the API key.
- Meta Cloud API numbers —
windowType: "META_24H".openis true when the contact’s last inbound message arrived within the last 24 hours;expiresAtislastInboundAt+ 24h. While the window is open, free-form messages are allowed; once it closes, sends fail withMETA_OUTSIDE_24H_WINDOWand you must use an approved template. - Web (unofficial) numbers — no Meta restriction:
windowType: "NONE"andopenis always true;lastInboundAt/expiresAtare still returned informatively.
Check it before sending free-form content to decide between free-form and template messages.
Requires a number-scoped key.
Authorizations
Your ps_ API key
Query Parameters
Contact phone number in E.164 format, with or without the leading + (digits also accepted).
Response
Service window status
Whether free-form messages can be sent right now. Always true for web (unofficial) numbers.
true
META_24H for Meta Cloud API numbers (24-hour window enforced); NONE for web (unofficial) numbers.
META_24H, NONE "META_24H"
UTC ISO timestamp of the contact's most recent inbound message, or null when none is known.
"2026-07-18T10:00:00.000Z"
UTC ISO timestamp when the window closes (lastInboundAt + 24h), or null. Informative on web numbers.
"2026-07-19T10:00:00.000Z"