I have a form where customer can pay for a download and it gets emailed to them. Inside of this program there is a link for a free upgrade. it is a link with the coupon at the end of the URL
payment=coupon&coupon=FREEUPGRADE and the coupon code is hidden, but just to be safe would there be a way that the form can validate that the email they enter to send the program to is already in the entries table - i.e. they have already purchased?
actually thinking about it even if the same user(email address) doesn’t use the coupon - could I apply the coupon if they come back to purchase a new version?
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