One guy in brazil is selling one amazing wordpress plugin, for example user read your blog review, but not click any affiliate link
But just for visit your blog the cookie for the offer is activated, now if he go to google and click on the advertiser you still receives the comission, i cannot see something similar in english, and my blog is not wordpress, anyone already heard about it? if i hire a freelancer do to a custom script for my blog it have any specific name? ( sorry my english)
Most likely that's set up between the Wordpress plugin and the affiliate.
The affiliate needs to have code in place to check for an existing cookie on the customers browser when purchasing product and if found, send postback for you with conversion.
This is called cookie stuffing and it's actually against the terms of most, if not all, affiliate networks. When caught, it can get you banned. Are you sure you want to do it? 
More on the subject here :
https://en.wikipedia.org/wiki/Cookie_stuffing
https://www.adpushup.com/blog/cookie...te-publishers/