programmatically excluding a shipping module, ref $_SESSION from admin

[bunyip]

You need to use a slightly different approach and edit the file a few lines further down. Leave the enable check as per the original.

at line 78, edit this line:

      return $this->quotes; 

to include your minimum cost check

if ($_SESSION['cart']->show_total() > 49.99) {
return $this->quotes;
} else {
return false;
}