I am trying to add a part to my checkout that will allow my customers to add a promotional code for a discount, say 10-15% for joining my mailing list. I have built my website myself with a template from weebly.com but they are telling me it has to be sorted with paypal. I see a lot of sites with this option so I assume it can't be too difficult to install.Any help/advice would be warmly received.
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