Thank you for the cookbook but doesn't help too much. As I mentioned before, I'm using the API, not Fusion. But I guess that's a start 

I need to use API, as the persons assigned to stages of the approval are different based on the issue. Do you know how to do that?

Hi there, I'm trying to create a single use approval process for a issue without any success though. Approval must be with multiple stages and the next stage can only be approved after current stage has been approved. Any idea(s) on how to achieve this?