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There is no code to add, no library and nothing to call. Everything below comes from the running app, so it cannot describe something that is not there.
Every community you work gets a link on your own domain, never a short link on ours. A short link pasted into a community looks like a tracking link, and that is the thing that marks you as a spammer and costs you the trust you went there to build.
yoursite.com/?utm_source=reddit&utm_medium=community&utm_campaign=r-rails
Those are the standard parts of a web address that every analytics tool already reads. That is the whole setup. You paste the link into the community, and the numbers arrive on their own.
You set both at /setup. We store them encrypted and never write to either account. We never show a key back to you once it is saved.
Your analytics knows a visit came from a community. Stripe knows someone paid. Nothing links those two records, and linking them by timing would be a guess.
So we count clicks for each community and money for each product, and we never claim to know which community won you a particular customer. We can still answer about a community that costs you real time and sends almost nobody, because that answer uses numbers we actually have.
We never receive a name or an email address, and no screen ever shows one of your customers.