Have been having two ProStores websites which use PayPal Express. A ProStores cart can only work with an API certificate whereas Zen Cart needs an API signature. You can't have both which is really annoying. Ebay owns PayPal and also owns ProStores, go figure.

We recently signed up for PayPal Website Payments Pro so we can offer checkout using credit card on our 2 Zen Carts. (www.mlblicenseplates.com, and www.nfllicenseplates.com).

MLBLicensePlates.com
Version: v1.3.9h
Default template
URL www.mlblicenseplates.com

NFLLicensePlates.com
Version: v1.3.9h
Template: lite_red
URL www.mlblicenseplates.com

I can't have PayPal on two ProStores sites AND on our 2 Zen Carts. I could opt not to have PayPal on the ProStores sites, delete the API certificate and create an API signature and enable PayPal on our two Zen Carts. But PayPal seems to break using this version. What other payment modules besides PayPal work flawless with v1.3.9h?

Any suggestions? Right now we only have the Check/Money order module enable with is sooo lame.