Greetings @thebarkacademy,
Please sandbox an order and note the results. For example, activate mail payment option and choose in the cart to test. You will not see anything until the order is completed, then WooCommerce automatically inserts the order information into the place where the shortcode is inserted via text mode (not visual mode where visual mode might include HTML that will corrupt the shortcode). The results of the shortcode are dynamic (only when something is triggered) not static, meaning the content is visible all the time.
It works in every editor we have tested. The only shortcodes related to this plugin are the two noted on the description of this plugin. WooCommerce has a few shortcodes that can be added like the user dashboard, but it will not be a viable invoice for a user to print out.
Clone the example in the screen capture seen on the description page before testing, leaving a space between each shortcode. If you are using a block editor like Visual Composer, WPBakery, or Avada Fusion Editor (what is used in the screen capture) as examples, then one shortcode per block.
Hope this helps!
