Thanks for the info.

As I learn to use this forum I may be able to answer these questions myself.

Re: my concerns about security...

My original question was about text appearing on an otherwise blank page instead of a payment confirmation message.

The text was "/my site folders/includes/modules/payment/square_webPay.php:333". I don't like the idea of site visitors inadvertently seeing the names of folders on my site along with file names with possible parameters.