Query vars

query-vars.php

<?php

$activation_key = '';

if( isset( $_GET['activation_key'] ) && ! empty( $_GET['activation_key'] ) ) {
  $activation_key = $_GET['activation_key'];
}

if( !empty( $activation_key ) ) {

    $idev_saleamt = '0';
    
    $idev_ordernum = $activation_key;

    printf( '<img src="https://actioncoin.idevaffiliate.com/sale.php?profile=72198&idev_saleamt=%s&idev_ordernum=%s" style="height:0px; width:0px; border:0px;" />', $idev_saleamt, $idev_ordernum );
    
}