The minimum payout for Perfectmoney is $0.1. Instant payout for all member.
Most probably this happened because you requested your payment to an invalid account.Kindly submit a support itcket
You can have 50 direct referrals even as a standard member.
You can have 500 direct referrals even as a Gold Member.
You can have Unlimited direct referrals even as a Gold and Diamond member.
Yes,you need to click at least 4 ads in order to earn from your referrals the next day.
No,you do not have to invest in order to get paid.
In order to find your referral link you have to go to your account and then on the left menu click on "Promotional Tools".There you will find everything you need in order to promote your referral link and get direct referrals.
You have to deactivate adblock from your browser settings.
Here is the list of the supported payment processors as well as the withdraw fees for each one :
Perfectmoney: 0.015$ + 1%