How long can a reward be taken back?

Most reversals happen within the first few weeks, while advertisers check their sales. That is why a month's earnings become withdrawable 30 days after the month ends.

A reversal that arrives later is still deducted from your balance, because the advertiser takes the money back from us too. If that takes your balance below zero, it is cleared from your future earnings, never invoiced to you.

Every reversal is sent to your server with the same transaction id as the original reward, so you can take the coins back from that user.