In Post Affiliate Pro
(Network) from version 22.214.171.124 and higher there is a possibility to define a Callback URL that can be executed after each recorded transaction. In its URL parameters (GET parameters) you can use several variables available from the Insert variable
The merchant (network owner) can define the callback URL in the merchant panel at Configuration > Tracking settings > Callback URL
You can choose the desired GET parameters from the Insert variable drop-down menu.