Version 2.0 is merely the name I'm using for all the changes thus far. Since I have decided I'm not going to pursue any further enhancements before releasing a new version, using this issue to track anything left to do before releasing this version as stable.
[25-Aug-2018 18:42:04 UTC] Micropub Error: 403 forbidden - Unauthorized
[25-Aug-2018 18:42:04 UTC] REST request: /micropub/1.0/endpoint: {"type":["h-entry"],"properties":{"published":["2018-08-24T17:44:13-07:00"],"syndication":["https:\/\/www.swarmapp.com\/user\/11479\/checkin\/5b80a65de0c0c9002c0c8589"],"content":["Being lazy for dinner tonight."],"photo":["https:\/\/igx.4sqi.net\/img\/general\/original\/11479_Z5VSLqOla8M3LhlRo_7QKUXeiGvaufQM1NTUYg32Dp0.jpg"],"checkin":[{"type":["h-card"],"properties":{"name":["Gerrish Grill"],"url":["https:\/\/foursquare.com\/v\/5b66159f2db4a9002ce66d2b"],"latitude":[34.1745],"longitude":[-118.09457],"locality":["Pasadena"],"region":["CA"],"country-name":["United States"],"postal-code":["91107"]},"value":"https:\/\/foursquare.com\/v\/5b66159f2db4a9002ce66d2b"}],"location":[{"type":["h-adr"],"properties":{"latitude":[34.1745],"longitude":[-118.09457],"locality":["Pasadena"],"region":["CA"],"country-name":["United States"],"postal-code":["91107"]}}]}}(Header Absent)
[25-Aug-2018 18:42:04 UTC] REST result: /micropub/1.0/endpoint: {"error":"forbidden","error_description":"Unauthorized"}(403) - null(User ID: 0)
[25-Aug-2018 18:42:04 UTC] PHP Warning: Invalid argument supplied for foreach() in /htdocs/wp-includes/rest-api/class-wp-rest-server.php on line 1259
[25-Aug-2018 18:42:08 UTC] PHP Notice: Array to string conversion in /htdocs/wp-includes/formatting.php on line 1045
[25-Aug-2018 18:42:08 UTC] PHP Notice: Array to string conversion in /htdocs/wp-includes/formatting.php on line 1045
[25-Aug-2018 18:42:08 UTC] PHP Notice: Array to string conversion in /htdocs/wp-includes/formatting.php on line 1045
[25-Aug-2018 18:42:09 UTC] PHP Notice: Array to string conversion in /htdocs//wp-includes/formatting.php on line 1045
[25-Aug-2018 18:42:12 UTC] PHP Notice: Array to string conversion in /htdocs/wp-includes/formatting.php on line 1045
[25-Aug-2018 18:42:12 UTC] PHP Notice: Array to string conversion in /htdocs/wp-includes/formatting.php on line 1045
[25-Aug-2018 18:42:14 UTC] http://nominatim.openstreetmap.org/reverse?format=json&extratags=1&addressdetails=1&lat=45.53548&lon=-122.621244&zoom=18&accept-language=en-US
[25-Aug-2018 18:42:15 UTC] http://nominatim.openstreetmap.org/reverse?format=json&extratags=1&addressdetails=1&lat=45.53548&lon=-122.621244&zoom=18&accept-language=en-US