[mpol]

Okay, thank you. I see Gitlab is mostly Ruby. Just to get a general idea of the code this is a simple PHP function to use it:

https://plugins.trac.wordpress.org/browser/gwolle-gb/trunk/f...

That function can be called when the register form has been submitted. It will return true or false. Forget about the transient stuff, that is just WordPres caching stuff.

You don't need an API key like with Akismet. You would only need it if you want to add or remove entries from the SFS database. It really is much simpler. Ofcourse you might want to have a checkbox in the settings. But still, in an afternoon you might be able to finish this :)

Wish you the best.

[lbierner]

Great suggestion, this looks like a very straightforward service and implementation. All open source as well.