Unfortunately the referral system built into the faucet is meant to be used only by the faucet.
However, with some coding it can be used for other stuff.
The extension maintains an association of users to their referrers via a user meta value.
Every user who is referred from another user should have a user meta with name wallets-faucet-referrer-id, and value the id of the user who referred them. You can tell this to your developer.
hope this helps
kind regards