Ultimately this is just an orchestration tool for publishing HL7v2 messages. You have to write your own pathways and segments, or push preconfigured HL7v2 messages. Take a look at the dashboard, you'll see what I mean[1].
Fairly sure they built this to test their HL7v2 store[2]. Also presuming it hasn't been very active given that Google surprisingly shut down their Healthcare division (and probably restarted it somewhere)[3].