square.onLaborScheduledShiftUpdated subscribes to labor.scheduled_shift.updated for the selected seller. It requires TIMECARDS_READ.
Example
automations/square-on-labor-scheduled-shift-updated.automation.ts
Event
A scheduled shift was updated. The event data contains the updated ScheduledShift object. The signal resolves to the officialSquare.LaborScheduledShiftUpdatedEvent payload with type narrowed to labor.scheduled_shift.updated.