Starts a time entry for the token's user, stamped with the current time. Pass crew_id, and optionally job_id, latitude and longitude, at the top level of the body.

• crew_id is required and must be one of your company's crews. Unless the user is an owner or admin, they must be a member of that crew.
• job_id ties the entry to a job; with coordinates, the clock-in is checked against the job's geofence.
• The request returns 422 if the user already has an open entry. Clock out of it first.
• Any role can clock in, and the token needs the write scope.