How Does Fedexcarrier Addon Work?

[davidmt3]

Hello mates

 

I managed to get this thing 

 

http://addons.prestashop.com/en/shipping-logistics-delivery-prestashop-modules/4164-fedexcarrier.html

 

 

connected to my FedEx Web Services panel, with some support from them.

 

However... what is this add on supposed to do?

 

It doesn't calculate the shipping fee according to weight or anything. even when I change the fee base to prices, it does wrong again!

 

Any ideas of how this addon works?

 

Thanks!