Problem setting up Google analytics goals with payment module

[avilet]

Hi

 

I set up google analytics goals with order-conf as destination page. As i compared goal statistics with real prestashop data i saw that there was about 30% more sales than goal completions. It must be because most customers pay with local banklinks module that does not require customer to "return to merchant" after finishing payment. If i use page previous to order-conf, then i obiously see more goal completions than sales.

 

Maybe there is any other way to accurately set up analytics goals that i can not think of?

 

Thanks in advance