While Allen Payne was a main character in the early seasons of "House of Payne," he did not leave the show due to an exit or conflict. He simply was not a part of the show after its first two seasons.
The character of Michael Payne, played by Allen Payne, was written out of the show in Season 2 due to the actor's decision to pursue other opportunities. The show's creators did not address his departure explicitly, but the character simply disappeared from the narrative.
So, Allen Payne wasn't "fired" or "left" the show in a dramatic fashion, his character simply wasn't continued in the series after Season 2.