I am not a developer and have never uploaded a website so I don't understand. This is my connection file on the internet. My internet info is different than my testing info. Are you saying that hostname_dbc = "localhost" needs to be changed to "www.mySite.com". The pp_confirm.php is failing because it is using my PayPal sandbox credentials which it shouldn't since I'm live now. It is the PayPal pages that is bringing in the wrong credentials but I don't know from where. Please be specfic if this is not where the problem is.
$hostname_dbc = "localhost";
$database_dbc = "";
$username_dbc = "";
$password_dbc = "";
$dbc = mysql_pconnect($hostname_dbc, $username_dbc, $password_dbc) or trigger_error(mysql_error(),E_USER_ERROR);