There's many ways to achieve this. Usually any standard protocol will make it possible. On the web specifically, micropub and activitypub were designed with in

There's many ways to achieve this. Usually any standard protocol will make it possible. On the web specifically, micropub and activitypub were designed with interoperability in mind (for the microformats and activitystreams formats respectively). We need to use more of these (or other) standard protocols in every backend project we make: our blogs, agendas..