Welcome to our UiPath Forum! 
I hope my blog post will give you some insights:
It goes in depth about a specific feature implemented in 2019.4, but you can just as well learn how to use the Orchestrator API from it.
ashokkarale
MD_Farhan1
Ajay_Mishra
postwick
Dheerendra_vishwakarma
Anil_G
chandreshsinh.jadeja
Gautham_Pattabiraman
vrdabberu
aravindbalineni123