In order to set up Refersion tracking with RecurHub please follow these steps:
Step 1: Login to RecurHub
Log into your account and go to "Settings" in the top navigation bar:
Step 2: Enter Fulfillments
Click on the "Fulfillments" on the left:
Step 3: Enter Private Key
Find the section for Refersion and enter your private (secret) API key from Refersion to enable tracking: