when i view source of the confirm page i see the following:
<input type="hidden" name="business" id="business" value=".$row_rsSiteInfo['siteAPIusername'] ." />
it looks you have not correctly coded the value of the business form element.
how is this coded on your php page:
it should look similar to:
<input type="hidden" name="business" id="business" value="<?php echo $row_rsSiteInfo['siteAPIusername'] ; ?>" />