System event emitted when the initial history sync has completed (only when historySync is enabled). Fires after the RECENT sync finishes. This is a system event — it is always delivered regardless of event filter configuration and cannot be opted out of.
Unique event identifier
The ID of the WhatsApp instance that generated the event
The timestamp when the event was received
The type of event
initial_sync_finished Empty object, event signals sync completion
Return a 200 status to indicate that the data was received successfully