I added it but that didn't seem to do the trick. Here's all the PHP I have at the top right now:
<?php session_start(); ?>
<?php
//WA eCart Include
require_once("../WA_eCart/bellaCart_PHP.php");
?>
<?php
$bellaCart->GetContent();
?>
<?php
require_once("../WA_eCart/PP_ECO_Scripts/PP_ECO_PHP.php");
?>
<?php
require_once("../WA_eCart/Adv_CO_Scripts/PP_DirectPayment_PHP.php");
?>
Should I make sure that session command is in all the checkout pages?