Hi onelakebum,
If you would like to pre-populate your customer informations then instead of use <INPUT TYPE="hidden" NAME="cmd" VALUE="_xclick"> you will need to use <INPUT TYPE="hidden" NAME="cmd" VALUE="_ext-enter">
<INPUT TYPE="hidden" NAME="redirect_cmd" VALUE="_xclick">.
Please refer to the Buy Now manual.
https://www.paypal.com/en_US/pdf/single_item.pdf page 40
Paulam
PayPal Tech Support Agent
PayPal an eBay company