square.onLaborTimecardUpdated subscribes to labor.timecard.updated for the selected seller. It requires TIMECARDS_READ.
Example
automations/square-on-labor-timecard-updated.automation.ts
Event
A timecard was updated. The event data contains the complete Timecard object. The signal resolves to the officialSquare.LaborTimecardUpdatedEvent payload with type narrowed to labor.timecard.updated.