FLAT_SMOOTH_PATHWAY_TO_FRONT_DOOR
'''6. Check-in / Check-out''
Use the values below if you want to
*send different times to Airbnb than to other channels
*send 25 for check-in
*send 25 or 26 for check-out
*offer flexible check-in
CHECKINSTART 25
CHECKINSTART FLEX
CHECKOUTEND 26
CHECKOUTEND FLEX