Below is the checkout page I got after setting up a test registration. While I have not setup my paypal sandbox yet, this seems to be a little raw.
Also, at some point, it would be nice to be able to edit this page.
Checkout error
Checkout error
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- snapshot1.png (103.82 KiB) Viewed 199929 times
Re: Edit Questionnaire
Looks like it's hitting an uncaught error, likely due to the PayPal parameters being missing. If you set debug to 2 in config/core.php, you'll get useful error messages.
The text of the offline payment notice is editable in Configuration -> Settings -> Registration, as is the refund policy.
The text of the offline payment notice is editable in Configuration -> Settings -> Registration, as is the refund policy.
Re: Edit Questionnaire
I guess I should just keep error checking on, for now, while I test things out. 
So if I turn off online payment, the error goes away and everything is good.

So if I turn off online payment, the error goes away and everything is good.
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- snapshot2.png (76.27 KiB) Viewed 199926 times
Re: Edit Questionnaire
I'll look at why the "undefined property" error is coming up, but it seems like your PHP doesn't have the cUrl library included / enabled? That's going to be required for PayPal support.
Re: Edit Questionnaire
I've fixed this error, and also added checks for the cUrl library wherever features that depend on it can be set, so if you don't have cUrl, you will get a warning message and not be able to turn on PayPal.