PayPal IPN with button to change a user's group upon cleared payment

function agregarmember_groups
	{
		global $modx;
		// Init our array
		$dbTable = array();
		$dbTable['id']         = $modx->db->escape('150');
		$dbTable['user_group'] = $modx->db->escape('3');
		$dbTable['member']     = $modx->db->escape('[[+modx.user.id]]');
		$dbTable['role']       = $modx->db->escape('1');
                $dbTable['rank']       = $modx->db->escape('0');
		// Run the db insert query
		$dbQuery = $modx->db->insert($dbTable, 'memeber_groups' );
		return true;
	}

		$dbQuery = $modx->db->insert($dbTable, 'memeber_groups' );

<?php
// PHP 4.1

// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';

foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$req .= "&$key=$value";
}

// post back to PayPal system to validate
$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);

// assign posted variables to local variables
$item_name = $_POST['item_name'];
$item_number = $_POST['item_number'];
$payment_status = $_POST['payment_status'];
$payment_amount = $_POST['mc_gross'];
$payment_currency = $_POST['mc_currency'];
$txn_id = $_POST['txn_id'];
$receiver_email = $_POST['receiver_email'];
$payer_email = $_POST['payer_email'];

if (!$fp) {
// HTTP ERROR
} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
$res = fgets ($fp, 1024);
if (strcmp ($res, "VERIFIED") == 0) {
// check the payment_status is Completed
// check that txn_id has not been previously processed
// check that receiver_email is your Primary PayPal email
// check that payment_amount/payment_currency are correct
// process payment

function agregarmember_groups
	(
		global $modx;
		// Init our array
		$dbTable = array();
		$dbTable['id']         = $modx->db->escape('150');
		$dbTable['user_group'] = $modx->db->escape('3');
		$dbTable['member']     = $modx->db->escape('[[+modx.user.id]]');
		$dbTable['role']       = $modx->db->escape('1');
        $dbTable['rank']       = $modx->db->escape('0');
		// Run the db insert query
		$dbQuery = $modx->db->insert($dbTable, 'member_groups' );
		return true;
	)

}
else if (strcmp ($res, "INVALID") == 0) {
// log for manual investigation
}
}
fclose ($fp);
}

<?php
// PHP 4.1

// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';

foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$req .= "&$key=$value";
}

// post back to PayPal system to validate
$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);

// assign posted variables to local variables
$item_name = $_POST['item_name'];
$item_number = $_POST['item_number'];
$payment_status = $_POST['payment_status'];
$payment_amount = $_POST['mc_gross'];
$payment_currency = $_POST['mc_currency'];
$txn_id = $_POST['txn_id'];
$receiver_email = $_POST['receiver_email'];
$payer_email = $_POST['payer_email'];

if (!$fp) {
// HTTP ERROR
} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
$res = fgets ($fp, 1024);
if (strcmp ($res, "VERIFIED") == 0) {
// check the payment_status is Completed
// check that txn_id has not been previously processed
// check that receiver_email is your Primary PayPal email
// check that payment_amount/payment_currency are correct
// process payment

function insert_my_rows() {
	global $modx;
	$table_name = $modx->getFullTableName( 'member_groups' );

        $id = ('150');
        $user_group = ('3');
        $member = ('[[+modx.user.id]]');
        $role = ('1');
        $rank = ('0');

	$fields = array('id'	        => $id,
			'user_group'	=> $user_group,
			'member'	=> $member,
			'role'	        => $role,
                        'rank'	        => $rank,
			);
	
	$modx->db->insert( $fields, $table_name);
}

}
else if (strcmp ($res, "INVALID") == 0) {
// log for manual investigation
}
}
fclose ($fp);
}