You can check your available vouchers on the "Wallet" section in the Asda Rewards app. If you use Grocery Home Shopping the vouchers will automatically be applied to your order when you checkout. The deduction will be visible above your order total.
If you shop in store, please make sure you scan your rewards barcode before you use a voucher. Once you have scanned your rewards barcode, go to the “Wallet” section of the app, select the voucher you want to use and scan it. You will see the voucher value come off the total. You can spend as many vouchers as you like. Please check that your total spend is the same to or greater than the value of the voucher you expected to use. You can’t use a voucher on a shop which is less than the voucher value. If your voucher is still not applying, check the data connection or Wi-Fi connection is stable.