Hi there @boutzamat,
I understand that you could be reluctant to install another extension to your site.
We use the Jetpack connection to authenticate each request and, if you use the shipping label service, to charge your credit card on file. Also, installing Jetpack gives your store additional security and stability.
If you’re still concerned about installing an additional plugin, note that once Jetpack is installed, you can toggle off Jetpack modules on your site and the connection with WooCommerce Shipping would still work.
You are welcome to read up on it in more detail here: https://woocommerce.com/document/woocommerce-shipping-and-tax/woocommerce-shipping/#frequently-asked-questions
Cheers,
Sven
