Attach a PDF to Order Completed Emails
Attaches a file, such as your terms and conditions, a user guide or a returns form, to the WooCommerce "Order completed" email.
Snippet Library
Email snippets for WordPress
Snippets for the emails WordPress sends: change the sender name and address, add a Reply-To header, send HTML email and turn off notifications you do not need. For site owners who want their messages to arrive and look right.