Pleased to announce: One-Page Checkout for Zen Cart 1.5.4 and later!

This plugin's been developed from the ground-up, using the Zen Cart 1.5.5a checkout-handling as the basis. It's been validated on Zen Cart 1.5.4 and 1.5.5a with all the built-in shipping methods (plus ups and usps) and a couple of the more "complicated" (i.e. Authorize.net/AIM and PayPal Express Checkout) payment methods.

https://www.zen-cart.com/downloads.php?do=file&id=2095



(Zen Cart v1.5.5a is the latest version of Zen Cart as of today's posting. No doubt there will be future versions. Consult the /docs/ documentation and/or discussions in this thread for further updates.)