Hello,
I am really new to Zen, so I was wondering if I have a customer with an account. Can I then create a custom invoice for customer to login and pay? Without having to look for items? And add a product that may/may not be "installed" into inventory?

Here is my situation, I sell stuff on web forums, sometimes its one-of-a-kind items, some items that are not listed on website because of qty or because I have negotiated with the customer on a price.

I would basically like to send a payment request via Zencart into customers My Account (or something equivalent) and have them checkout based on our negotiations online.

hope that made sense!
Thanks in advance