On the payment day (the 1st of the month) we will pay your PayPal, Payza or Payoneer account at some point up until 23:59 GMT.
This may not necessarily be the same time zone as you. Please see:
For the current time in GMT.
Another reason maybe that you have not earned the minimum amount the previous month:
http://www.paypal.com - Minimum withdrawal $5.
https://www.payza.com - Minimum withdrawal $5.
http://www.payoneer.com - Minimum withdrawal $10.
For example, if it is the 1st of December 2016, the payment will be for November 2016.
One more reason is that if you have changed your account details 72 hours within payment day:
withdrawal details changed
we will not send your payment for security reasons.