Someone who wrote another excellent Zen mod is already working on a temporary solution to this until the Zen masters redo the checkout. I tested it for them a few days ago. The problem is that it is not a true pwa setup.

It works well, accept the welcome email still gets sent, so he's working on fixing that. It still stores them in the db. You'd have to manually delete them after you receive the order because if they ever try to order again with the same email address, it says they are already in the system. Then you have the issue of you not being able to delete them right away, they come back and order again, and they'll find out they ARE in the system and then they are pissed at you for lying to them. It's too bad Zen Cart uses the email address as the user name. Maybe we could change that? In order for any of this to work, we'd also need something in the admin that says whether or not the person entered a password at checkout, maybe an icon of some sort next to their name?

A few days ago I strayed from Zen and messed with OSC, which has pwa, and I liked it, but its just not ZEN. Although I personally think customers should just sign up, unfortunately a lot of them leave for this reason and we've got to fix this. My "solutions" in the previous posts help somewhat, but its still a problem.