With support for locations finished, I was able to add support for checkins in a couple of hours this morning. You can only post a checkin via micropub, but you can edit them like any other post locally.

There's three remaining "tidbits" to be completed before I can mark location/checkin support is complete:Ā  use the sent published date time in the micropub request as the posts' published datetime, store/display the syndication urls in the post meta, and confirm microformat my location data. This is what they look like ā€“ checkin is from January 2nd :-)

An example checkin post with a photo