I'm currently uploading a new Icro beta, I hope it's available soon to all the testers! It switches micropub Auth header to "Bearer" and more smaller dynamic type improvements. There is way more to do in upcoming versions.
@eli I don‘t have a documentation. I currently don‘t have time to implement the whole micropub authentication flow. What I did to use Icro for my own micropub endpoint was logging in with Quill and copying the access token from the settings. I hope micropub enthusiasts are not too angry about this „workaround“.