I frequently have customers who have completed a transaction and need to pay an additional amount. So far I have had them call me so I can take their card info again over the phone and make the extra charge, and that turns into phone tag. I need a page where I can just email them the link and they can enter their billing address and credit card info and click submit, and it sends it to WPP, without having to log in or go through the add to cart and checkout process again. I don't care about Analytics, and I don't need zencart to process it. They can either enter the amount to pay or I can specify the amount via a url parameter.
Has anyone made something like this?
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