The information is available in the plugin description:
“WooCommerce WP-Login automatically hides the redirect information in the address bar (if JavaScript is enabled), protecting against manipulation, and providing a more seamless user experience. It will also keep any URL (GET) parameters. These redirects can also include additional parameters for any developers out there, for both pre and post-authentication customization. It also supports the wp_login_url() and wp_logout_url() functions, passing the redirect and additional parameters to the login page and interrupting the default redirect to the “My account” page on logout if a redirect is specified, respectively.
Advanced Usage Example:
wp_redirect(wp_login_url(‘/your-target/here/?with=additional&post-authentication=parameters’) . ‘&with=additional&pre-authentication=parameters’);
This will pass the URL GET parameters within the wp_login_url() function to the final destination (post-authentication redirect) and pass the URL GET parameters near the end to the WooCommerce “My account” page (to be used pre-authentication), such as WooCommerce notices, session variables, tracking information, etc.”
To summarize, the plugin will now hide redirect information in the URL, and also provide the addition Advanced Usage functionality described above for developers. These features were exclusive to the Premium version of the plugin, but given there hasn’t been much need to maintain either version, it was decided that the Premium features would be incorporated in the free version (i.e. merging the two versions).
Feel free to let me know if you have any other questions.