its a little modification of post.php inside SOURCES folder.
Instructions:
Search For:
$points = $modSettings['shopPointsLimit'];
after that paste:
// Each X is the board id where u want to PAY, whit 1 credit. If the user posts on other boards not listed here, he gets NO points.
if ($board == "56785678578"){$points = "1";}
elseif ($board == "x"){$points = "1";}
elseif ($board == "x"){$points = "1";}
elseif ($board == "x"){$points = "1";}
elseif ($board == "x"){$points = "1";}
else {
{$points = "0";}
}