MEMBERSHIP 2 PRO - HOW TO APPLY COUPON CODE AUTOMATICALLY

code.php

<?php
/**
 * Configuration: Just set the query variable name in the first line - DEFINE
 * In the example, I have used coupon.
 * So, in my case the URL would be: http://domain.com/?coupon=AAAA
 * Where AAAA is the M2 coupon
 */

if( ! defined( 'M2_COUPON' ) ) define( 'M2_COUPON', 'coupon' );

add_action( 'init', 'm2_sess_init' );
function m2_sess_init() {
    if( ! isset( $_SESSION ) ) {
        session_start();
    }
}

add_action( 'template_redirect', 'm2_check_coupon' );
function m2_check_coupon() {
    if( isset( $_REQUEST[M2_COUPON] ) && $_REQUEST[M2_COUPON] != '' ) {
        $_SESSION['M2_COUPON'] = $_REQUEST[M2_COUPON];
    }
}

add_action( 'wp_footer', 'm2_apply_coupon' );
function m2_apply_coupon() {
    if( isset( $_SESSION['M2_COUPON'] ) && $_SESSION['M2_COUPON'] != '' ) {
    ?>
    <style>
        .membership-coupon{display: none;}
    </style>
    <script type="text/javascript">
    jQuery(function($) {
        if( ! $('.membership-coupon .ms-alert-box').length ){
            $('#coupon_code').val('<?php echo $_SESSION['M2_COUPON'] ?>');
            $('#apply_coupon_code').click();
        }
    });
    </script>
    <?php
    }
}