I have not found any documentation on accessing Blogger API using the default Credentials as you have indicated. General documentation about using the Bloggers can be seen on this link <https://developers.google.com/blogger>. The Blogger API is though a Google API but it is not supported by the GCP or the App Engine team. It is often recommended that posting inquiries on the Blogger API on the Blogger Community forum at https://support.google.com/blogger/community/?hl=en&gpf=%23!forum%2Fblogger, or Stack Overflow at http://stackoverflow.com/questions/tagged/blogger.
-- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/02750977-9a84-4859-a5f3-9e4b9c79aab5%40googlegroups.com.
