Some reasons why you have not received your payout may include:
Missing invoice information. Double check that your invoice information is completed, correct and up-to-date on your dashboard.
Minimum revenue requirement not met. There is a minimum amount required for payout. This minimum applies to all publishers. The minimum must be reached during the month that precedes the month in which you wish to be paid. Since payments are made NET 30, your payout will arrive 30 days after the end of the calendar month in which the minimum is reached and pertinent payment information received.