Start process instance using REST API

In my application I want to start a business process(created with axelor studio) via REST API. How can I accomplish ?

I don’t understand what you want to do

  1. I want to create a BPMN process (workflow) that does some service orchestration using the data via the repository classes (script task) and returns data.
  2. I want to trigger the process Instance via a REST API (request and response)

I did similar functionality using Flowable(BPMN) in the past. However I want to do the same inside axelor (embedded camunda bpmn (axelor studio).