Okay, I saw Eric's note to another user and put in the proper code for debugging. This is what I get from going the Express Checkout route or through the sandbox credit card:
Fatal error: Call to undefined function PP_DirectPayment_Result() in /homepages/22/d300453961/htdocs/checkout_failure.php on line 129
but line 129 is the debug code:
<?php echo(PP_DirectPayment_Result("Full Request")) ?>
Please help.
Best - Joe