WordPress plugin for affiliate referral system

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I want to create an affiliate system on WordPress . What I mean is when “Member A” invite other to join (ex. “Member B”) by using the ?referralId=MemberA querystring, then Member A get points or credits, and when Member B invite Member C, then Member B get points. Is there any WordPress plugin that can do that ?

I already tried Affiliate Pro Plus (http://wordpress.org/extend/plugins/affiliate-pro-plus/) but It’s not work as expected. When I try to register Member B using Member A’s referral, Member B does not count as Member A downline.

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  1. Don’t know about a plugin but this can be done easily with just two hooks and callback functions:
    First you add the refferer field to the registration form using register_form hook:

    add_action('register_form','show_reff_field');
function show_reff_field(){ ?>
    <input id="ref" type="text" tabindex="20" size="25" value= "<?php if (isset($_GET['ref'])){echo $_GET['ref'];} ?>"  name="ref" readonly="readonly"/>
<?php
}

    Then you just need to save it using user_register hook

    add_action('user_register', 'register_refferal');

function register_refferal($user_id) {
   $userdata = array();
   $userdata['ID'] = $user_id;
   wp_update_user($userdata);
   $userdata['ref'] = $_POST['ref'];

   if (isset($userdata['ref'])  && !empty($userdata['ref']) && $userdata['ref'] != ""){
        //get reffering user id by his login
        $refuser = get_user_by('login',$userdata['ref']);
        //get current refferial credit that user has
        $current_ref_credit = get_user_meta($refuser->ID, 'ref_credit', true);
        //add credit for the newly created user
        $current_ref_credit[] = $user_id;
        //save the changes
        update_user_meta( $refuser->ID, 'ref_credit', $current_ref_credit);
   }
}

    So all that is left to do is to let your users share there referral link:

    http://example.com/wp-login.php?action=register&ref=my_login_name

    So if my user name was “bainternet” then my referral link would be:

    http://example.com/wp-login.php?action=register&ref=bainternet

    and to see how many members are in a users downline here is a simple function which accepts a user ID and returns an array of user ids which he has reffered:

    function get_user_downline($user_id){
    return $current_ref_credit = get_user_meta($user_id, 'ref_credit', true);
}

    and its usage is simple:

    // to echo count of how many user with ID of 24 as reffered:
echo count(get_user_downline(24));

    // to list the users user with ID of 24 as reffered:
<ul>
<?php
    $reffed = get_users(array('orderby' => 'registered', 'include' =>  get_user_downline(24));
    foreach ($blogusers as $user) {
        echo '<li>' . $user->display_name . '</li>';
    }
?>
</ul>

    So just copy all of this code and you have a plugin for referral system