The minimum payout for Payeer,Perfect money is $0.01 and the next payout is $0.05 for all time.
Most probably this happened because you requested your payment to an invalid account.Kindly submit a support itcket.
You can have unlimited direct referrals even as a standard member.
Yes,you need to click at least 4 ads in order to earn from your referrals the next day.
No,you do not have to invest in order to get paid.
In order to find your referral link you have to go to your account and then on the left menu click on "Banners".There you will find everything you need in order to promote your referral link and get direct referrals.