Is the Flat Rate Shipping option available? Documentation ELEX Stamps.com Shipping Plugin with USPS Postage for WooCommerce Knowledge Base Is the Flat Rate Shipping option available? < BackCustomer: Has the Flat Rate Shipping option been added to the plugin yet? Support: Yes ! The Stamps.com plugin is ready with the Flat Rate Option. Previous How long does it take to install the Stamps.com plugin to woocommerce? Next Getting an error code when we input a zip code with an extension to it You must be logged in to post a comment.