Don’t forget that I’m listening to content in the class as well! Perhaps this will be your first listen webmention? 😉
For badges from static sites, you could simply use raw HTML on a page like Aaron Parecki outlines.1 The “sending” site doesn’t need to be able to send webmentions although the receiving site needs to be able to receive them. You can then use a service like http://mention-tech.appspot.com/ or https://telegraph.p3k.io/send-a-webmention to have your static site send the webmention for you!