Need inputs

Hi,
I’m in process of building an ecommerce site using wordpress 4.1.1. I’m planning to incorporate the below mentioned user registration process but not sure if this is possible with your plugin:
-Customer makes payment and receives a confirmation number (already done)
-Customer then needs to register and on registration page there is a “required” confirmation number field to allows only those customers who have made payment. Once customer enters a confirmation number and submits, it is matched with existing confirmation numbers in wordpress database to see if it exists and is allowed to register. Customer then logs on and is taken to customer area which allows him/her to upload pictures.
-As admin, I can post updates to customer’s area with new uploads..
I need inputs on how to do this? Any insights on which plugin/s I should use.

Thanks!