For people that are invited to your campaign and follow referral links to your website, if they join your campaign you will want to attribute their participation to their referrer so that the referrer gets rewarded or climbs the leaderboard and so on.
Here's where it should be installed:
At the campaign URL, ie. the page where your referral links direct people to.
If you are using a custom form, it should be installed in the page that contains the form and the page the form redirects to after submission.
In any page in your website where you are using any widgets from Viral Loops, such as the Viral Loops Popup or the Milestone Widget etc.
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