A drive thru window that has a sign up to notify cashier if you have a coupon or your coupon will not be honored written by management.
The management of this establishment left a notice on the window for their customers.
Posted on the window of a drive through is a message suggesting to notify your cashier if you have a coupon.
drive up window of a fast food restaurant, with information about coupons
A sign in a window says that people should notify the cashier if they have a coupon.