{
"inbox_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
"received_message_count": 3,
"redelivery": false
}API Reference
Message availability notification
Sent to the inbox’s notification_url when new messages are available to lease. The payload signals availability only — it does not include message content. Consumers should call the lease endpoint to retrieve messages.
WEBHOOK
messageAvailable
{
"inbox_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
"received_message_count": 3,
"redelivery": false
}Authorizations
OAuth 2.0 authentication.
Body
application/json
The unique identifier of the inbox that has new messages.
The number of new messages available to lease. When redelivery is true, this is a nonzero placeholder rather than an exact count.
True when this notification was manually re-sent after a delivery outage. received_message_count is a placeholder in that case, not a real count.
Response
200
Notification acknowledged
Last modified on September 16, 2026
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