https://www.okpay.com/en/partners/referral-program.html
We invite everyone to take advantage of a special referral opportunity. You can earn up to €500.00 EUR per each referred user. You, as a referrer, will receive 20% from any fee on referred user transactions and additionally 20% of transaction fees generated by 2nd-level referrals, i.e. those referred by your first referral. To maximize your profits, we recommend that you attract new users who are online stores or similar internet businesses generating plenty of sales/transactions.
https://www.okpay.com/en/partners/merchants.html