There are three types of users that you can have in your referral campaign.
Direct Users – These are users that have joined your campaign directly through the campaign link that you share with them.
Added Users – These are users that you have manually added to your referral campaign. You can add a user by uploading a CSV of your customers or your database.
Referred Users – These are users that have joined the referral campaign using a link sent to them by a person referring.