http://bentasker.i2p/posts/blog/software-development/adding-webmention-support-to-nikola.html
Whichever you use, once you're up and running, consider sending webmention.io 's maintainer Aaron Parecki a donation to say thanks (there are Venmo, Paypal and Cashapp links at the bottom of his profile). The service uses IndieLogin for authentication, so when you land on the page you'll see a sign-in box like this There's a little bit of inital setup required before we'll be able to login.