Unfortunately the integration should be able to create posts on some client’s blog from some external API calls, so authentication/authorization is a real need. Also, I’m trying to avoid the installation of any additional plugin on the client’s blog.
I’ve discovered that some services like Zapier and Jetpack are still using the XML-RPC API, so I’m still unsure to take a decision. Could you address this thread to some core dev so that they can share their opinion on that? Thanks for the attention and the quick replies!