Add a custom WooCommerce My Account endpoint

woocommerce.php

<?php
/**
* Add endpoint rewrite.
*/
function ip_custom_endpoint() {
  add_rewrite_endpoint( 'edit-wishlists', EP_ROOT | EP_PAGES );
}
add_action( 'init', 'ip_custom_endpoint', 10, 1 );

/**
* Insert the new endpoint into the My Account menu.
*
* @param array $items
* @return array
*/
function ip_new_menu_items( $items ) {
	$items[ 'edit-wishlists' ] = __( 'Wishlists', 'ip_master' );
	return $items;
}
add_filter( 'woocommerce_account_menu_items', 'ip_new_menu_items', 10, 1 );


$endpoint = 'edit-wishlists';

/**
* Insert the new endpoint content into the My Account area.
*/
function ip_endpoint_content() {
  echo '<div id="wl-wrapper" class="woocommerce">';
    	echo '<h2>Wishlists</h2>';
		echo get_template_part( 'wishlist-manage' );
	echo '</div>';
}
add_action( 'woocommerce_account_' . $endpoint .  '_endpoint', 'ip_endpoint_content', 10, 1 );