Zen Cart Roundup for Charity allows you to easily offer a charity "round up" in your checkout process.
Roundup appears as a set of radio buttons under the order total line items on the Checkout Payment Page, to round up to the nearest dollar, the nearest dollar p
lus $1, to round up a user-specified amount, or not at all.
If the Roundup is selected,it appears as a line item in the order total line items on the Checkout Confirmation Page.
If the option "I do not want to Roundup" is selected on the Payment Page, no Roundup line item will appear.