Hello again zbyneksmetana

This is set by WooCommerce not by our plugin, but please try this out: 

modify the WooCommerceService.php file in ..wp-content/plugins/ameliabooking/src/Infrastructure/WP/Integrations/WooCommerce/

and find the function GetCartUrl() 

and change 'cart' to 'checkout' in it so it will looks like this: 

/**
     * Get cart page
     *
     * @return string
     */
    public static function getCartUrl()
    {
        return wc_get_checkout_url();
    }

Hope this helps!

Please note that with each update this will be overwritten, but we will probably add an option for this in the next update which will need to be changed in the database (from false to true). 

You're welcome, zbyneksmetana

If you have any further questions or issues, please feel free to open a new ticket, and we'll gladly help.