Adding Custom WooCommerce MyAccount Endpoints

functions.php

<?php

// Add the endpoints
add_action( 'init', 'yanco_add_my_account_endpoints' );
function yanco_add_my_account_endpoints() {
    add_rewrite_endpoint( 'my-custom-endpoint', EP_ROOT | EP_PAGES );
    add_rewrite_endpoint( 'my-custom-endpoint-2', EP_ROOT | EP_PAGES );
}

// Make custom endpoints available to query vars
add_filter('woocommerce_get_query_vars', 'yanco_woocommerce_get_query_vars' );
function yanco_woocommerce_get_query_vars( $vars ) {
    $custom_endpoints = array(
        'my-custom-endpoint',
        'my-custom-endpoint-2',
    );
    
    foreach ( $custom_endpoints as $custom_endpoint ) {
        $vars[$custom_endpoint] = $custom_endpoint;
    }

    return $vars;
};

// Add content to endpoint
add_action( 'woocommerce_account_my-custom-endpoint_endpoint', 'yanco_endpoint_my_custom_endpoint_content' );
function yanco_endpoint_my_custom_endpoint_content() {
    echo '<h2>Custom End Point #1</h2>';
}

add_action( 'woocommerce_account_my-custom-endpoint-2_endpoint', 'yanco_endpoint_my_custom_endpoint_2_content' );
function yanco_endpoint_my_custom_endpoint_2_content() {
    echo '<h2>Custom End Point #2</h2>';
}