We are in need of customization of the signup pages, we need them perfectly integrated within our site.
I also need to know how these customizations would be affected when we do upgrades? How would we preserve all the settings?
And finally, we use plimus.com to process our online payments. We would want some modification made to the CE script such that when the customer has finished making the order, CE will redirect to the plimus.com page with all items that were selected, showing up in the plimus shopping cart.
This is what plimus had to say about it for your reference (I suppose this has to be incorporated into CE):
You can collect all the information (contract ids and quantity) on your site and post it to our server.
To do that you will need to create a form (and submit it to our server) as follows: