Important: There have been some coupon policy changes you may have noticed at Walmart. All register systems have now been updated to accept the new bar codes on coupons. Because of this, all coupons are supposed to be scanned on the flatbed scanner only. If they don’t scan, cashiers are instructed to return the coupon to you. Cashiers or managers may override or manually enter the coupons, but you should not expect that outcome. It’s at their discretion, varies by store, and sometimes by shift change.