Looking for extension/product for sales stats for customers

Hi There,

I’m hoping someone might be able to help me out. I’m new to Open Cart (and the forum) but I’ve found a lot of answers to previous questions here but not the one I currently need.

I’m looking for an extension or product that would do the following:

Customer/Author creates an account
Admin user links their author name to their customer account
Author gets a new option within their account called Sales
Sales has the breakdown of all of their sales on the website over a certain time period (in graph form)
Admin has the ability to enter sales from third party sites for Author to see sales. Those sales are on the same graph but in another colour.

A note at the bottom stating that third party figures may not be 100% accurate.

I’ve looked at extensions and I’ve found a few possibilities but since most, if not all, cost money, I don’t want to buy them if they’re the wrong thing.
I know of a website that has a similar function and they use product and I believe that each author is given a unique number.

Does anyone have any ideas?