Add the AffiliateWP menu (with content) to the WooCommerce My Account section

function.php

<?php

// Add new slug
function hellowp_add_premium_support_endpoint()
{
    add_rewrite_endpoint('affiliate-partner', EP_ROOT | EP_PAGES);
}

add_action('init', 'hellowp_add_premium_support_endpoint');

// ------------------
// Add new query var

function hellowp_premium_support_query_vars($vars)
{
    $vars[] = 'affiliate-partner';
    return $vars;
}

add_filter('query_vars', 'hellowp_premium_support_query_vars', 0);

// ------------------
// Insert the new endpoint into the My Account menu after ORDER menu

function hellowp_add_premium_support_link_my_account($items)
{
    $label = 'Partnerprogram';

    if (array_key_exists('orders', $items)) {
        $items = wcs_array_insert_after('orders', $items, 'affiliate-partner', $label);
    } else {
        $items['affiliate-partner'] = $label;
    }

    return $items;
}

add_filter('woocommerce_account_menu_items', 'hellowp_add_premium_support_link_my_account', 5, 1);

// ------------------
// Add content to the new endpoint

function hellowp_premium_support_content()
{
    echo '<h3>Legyélt Te is a Partnerünk!</h3><p> Szeretnéd támogatni az oldalunkat egy visszalinkkel? Adunk jutalékot cserébe. Minden értékesítés után (ami a te linkeden keresztül jött) 20%-ot adunk neked! Jól hangzik ugye?!</p>';
    echo do_shortcode('[affiliate_area]');
}

add_action('woocommerce_account_affiliate-partner_endpoint', 'hellowp_premium_support_content', 10, 5);