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In Liberty 5, there are different type of coupons. You can have a Variable Amount, Flat Amount, Percentage, Split with Consignor coupons. See Using Coupons in POS for more information.
How To Accept A Coupon In POS
1.Open Point of Sale Module.
2.Click on New Sale. Login if prompted.
3.Click on the Coupon button. Select the appropriate coupon you want to apply to the sale.
4.Continue transacting the sale.