I took a good look at both modules about a week ago - both great but rather different approaches.
John's approach (found here) is, as he mentions a straight 'port' of the way the Dwolla plugin functions w/ other platforms like creLoaded , OSCommerce , & Magento. Meaning, the customer is not redirected to another site & then directed back to the cart - the whole purchase is done 'from the cart'.
Matt's approach, (the last time I looked), redirects to a Dwolla HUB page to complete the purchase & then returns to the shopping cart.
Given that , with a little work it sounds like the discount functionality is almost there, but I don't think it's going to be a straight case of merging the module files.
I've started a thread over in the Dwolla developer community forum on Zen Cart ; We'd love to see you over there if there's anything you'd like quick service or consultation on : http :// http://www.dwolla.org/d/forumdisplay...rt-Integration
I also posted a tiny update of John's module : http://www.zen-cart.com/index.php?ma...oducts_id=1894
Cheers!
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