I recently purchased Web Form Builder as a way to help get information for my website. I am trying to use paypal for people to register and pay online. I've created my form and I'm able to connect to paypal using my token. In my testing I'm having two issues that I cannot seem to resolve.

1. Once in paypal I cancel my transaction I return to my webpage but I'm getting a warning (see attached)
"Warning: [ err 2/line 23/mergeformpost.inc.php] DOMDocument::loadHTML() [<a href='domdocument.loadhtml'>domdocument.loadhtml</a>]: Tag canvas invalid in Entity, line: 97"

2. I am currently using S-drive and my entries are being logged even though the user did not pay for the event. Is there way to know if the user completes the transaction?

Thanks,
Jason