Installing Reflio affiliate manager

I am trying to install Reflio to handle my affiliate deals. In their walkthrough, in step 6 they ask to install the following JS when a user signs up:
<script type="text/javascript">
   await Reflio.signup('yourcustomer@email.com')
</script>

I am a bit lost in where to place this, since the sign up is a bit abstracted with the Google OAuth.
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