We have one product, payment is by PayPal. Before going to PayPal need to apply a discount. We want to create a system where people can enter a gift certificate code to get product free (ie 100% discount) or enter some code to get a specific discount (ie SAVE10 - get a 10% discount). We have one product, payment is by PayPal. Befo
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创建折扣代码系统（MySQL / php）
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