trouble using data from url and inserting it to database

I am trying to use callback url's to insert users into my database.

Example of my callback url: (note i can not change this as it is created by a site i do not own tapjoy if its important)

http://facebook.0dollerhost.com/postback.php?snuid=test&currency=111&id=A1B2C3D4&verifier=30af489b51e0c653d65aeb41c071ad95 

Code (markup):

i need it to add snuid to userid and currency to points.
but if the userid exists then just update points


here is what is already in the script

include('config.php'); 

$subid = $_POST['snuid'];
$points = $_POST['currency'];
$earn = $_POST['id'];
$type = $_POST['verifier'];
$campaign = ['0dolelr'];
echo $subid.' earned '.$points.' points';

// Log postback results into our history
mysql_query("INSERT INTO `history` VALUES(null,'".time()."','".$subid."','".$points."','".$earn."','".$type."','".$campaign."')");

// Adjust user points
if ($points > 0) {
 $query = mysql_query("SELECT * FROM `user` WHERE `userid` = '".addslashes($subid)."'");
 if (mysql_affected_rows() > 0) {
  $row = mysql_fetch_assoc($query);
  mysql_query("UPDATE `user` SET `points` = '".($row['points'] + $points)."' WHERE `userid` = '".addslashes($subid)."'");
 }
 else
 {
  mysql_query("INSERT INTO `user` VALUES('".addslashes($subid)."','".$points."')");
 }
}

Code (markup):

it does not give any output from @echo $subid.' earned '.$points.' points';@
nor does it add anything to the database if the user doe or does not exist.

How can i fix this?
also i have checked config several times and there is no error there

Many thanks

 

try this

include('config.php'); 

$subid = $_REQUEST['snuid'];
$points = $_REQUEST['currency'];
$earn = $_REQUEST['id'];
$type = $_REQUEST['verifier'];
$campaign = ['0dolelr'];
echo $subid.' earned '.$points.' points';

// Log postback results into our history
mysql_query("INSERT INTO `history` VALUES(null,'".time()."','".$subid."','".$points."','".$earn."','".$type."','".$campaign."')");

// Adjust user points
if ($points > 0) {
 $query = mysql_query("SELECT * FROM `user` WHERE `userid` = '".addslashes($subid)."'");
 if (mysql_affected_rows() > 0) {
  $row = mysql_fetch_assoc($query);
  mysql_query("UPDATE `user` SET `points` = '".($row['points'] + $points)."' WHERE `userid` = '".addslashes($subid)."'");
 }
 else
 {
  mysql_query("INSERT INTO `user` VALUES('".addslashes($subid)."','".$points."')");
 }
}

PHP:

 

It needs to be $_GET if it needs to be from the url. Or as suggested $_REQUEST if you want it to work for both post and get