/**
     * Create multi Customers
     *
     * @param MagentoCustomerApiDataCustomerInterface $customer
     * @return string[]
     */
    public function save(MagentoCustomerApiDataCustomerInterface $customer);

/**
     * Create multi Customers
     *
     * @param MagentoCustomerApiDataCustomerInterface $customer
     * @return array()|associativeArray()
     */
    public function save1(MagentoCustomerApiDataCustomerInterface $customer);