In response to self checkout and coupons, each Walmart in my area seems to work coupons at those registers differently. Some allow the customer to scan and insert the coupon in the designated slot by the machine (there is a button for coupons on the menu when you are finished ringing up your order). Some prompt to have the customer hand the coupons over to the cashier looking over the self check out.
I guess it is up to each individual store to decide their procedures, much like what coupons they will accept (newspaper, store, IP)...unfortunately.
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