My client wants me to redo her website and uses 1shoppingcart for her sales. I'm looking at my options.
First of all, I've only run into a couple notes about using 1shoppingcart here on WordPress and they discussed the problem with using foreign html code in pages or posts.
Now I've had no problem with foreign code because I use the AWSOM News Plugin for Paypal Buttons and RSS feeds with pages and posts. I would think that I'd be able to put the insertion code (assuming that's what I'd have to do) whereever it needs it on my clients' site. But without doing a lot of research, perhaps someone has an answer or success story.
Otherwise, it's off to Dreamweaver, I guess.