Upsos has a very profitable referral program.
It allows you to get income from all orders of users you invite.
Each user has their own unique referral link on their dashboard. To attract referrals, place your referral link on any web resources: blogs, forums, social networks, etc. For a year, you will get 2% of all orders placed by your referral and successfully completed by the Service Provider.
In your dashboard, you can see the list of users who registered using your referral link, as well as bonuses from each order placed by your referral.