post https://api.securevan.com/v4/employers//shiftTypes/
Use this endpoint to link a Shift Type to an existing Employer.
Accepts a shiftTypeId for an existing Shift Type with optional overrides for defaultStartTime and defaultEndTime.
If successful, the endpoint responds with HTTP Status Code 201 Created and a Shift object in the response body.
If the specified Employer or Shift Type does not exist, this endpoint will return an error with HTTP Status Code 404 Not Found.