heynurse, I just upgraded to 3.03 myself, and re-adding hacks I ran into the same problem. This is what I put in, and everything appears to be working fine. I don't receive any errors at all. Hopefully it's correct.
PHP Code:
case 'paypal':
$form['action'] = 'https://www.paypal.com/cgi-bin/webscr';
$form['method'] = 'post';
/// Add In For Reacuring Payments
$paypalextra = $DB_site->query_first("SELECT * FROM " . TABLE_PREFIX . "subscription AS subscription WHERE subscriptionid=$subscriptionid");
if($paypalextra[reoccur]==0){// It is one time
$form['hiddenfields'] = "
<input type=\"hidden\" name=\"cmd\" value=\"_xclick\" />
<input type=\"hidden\" name=\"business\" value=\"$vboptions[ppemail]\" />
<input type=\"hidden\" name=\"item_name\" value=\"$title Subscription\" />
<input type=\"hidden\" name=\"item_number\" value=\"$item\" />
<input type=\"hidden\" name=\"amount\" value=\"$cost\" />
<input type=\"hidden\" name=\"currency_code\" value=\"$currency\" />
<input type=\"hidden\" name=\"no_shipping\" value=\"1\" />
<input type=\"hidden\" name=\"shipping\" value=\"0.00\" />
<input type=\"hidden\" name=\"return\" value=\"$vboptions[bburl]/$vboptions[forumhome].php\" />
<input type=\"hidden\" name=\"notify_url\" value=\"$vboptions[bburl]/subscriptions/paypal.php\" />
<input type=\"hidden\" name=\"custom\" value=\"$userinfo[username]\" />
<input type=\"hidden\" name=\"no_note\" value=\"1\" />";
}else{
$form['hiddenfields'] = "
<input type=\"hidden\" name=\"cmd\" value=\"_xclick-subscriptions\" />
<input type=\"hidden\" name=\"business\" value=\"$vboptions[ppemail]\" />
<input type=\"hidden\" name=\"item_name\" value=\"$title Subscription\" />
<input type=\"hidden\" name=\"item_number\" value=\"$item\" />
<input type=\"hidden\" name=\"currency_code\" value=\"$currency\" />
<input type=\"hidden\" name=\"ammount\" value=\"$cost\" />
<input type=\"hidden\" name=\"a3\" value=\"$cost\" />
<input type=\"hidden\" name=\"p3\" value=\"$paypalextra[length]\">
<input type=\"hidden\" name=\"t3\" value=\"$paypalextra[units]\">
<input type=\"hidden\" name=\"src\" value=\"1\">
<input type=\"hidden\" name=\"sra\" value=\"1\">
<input type=\"hidden\" name=\"no_shipping\" value=\"1\" />
<input type=\"hidden\" name=\"return\" value=\"$vboptions[bburl]\" />
<input type=\"hidden\" name=\"no_note\" value=\"1\" />";
}
break;