Make sure you look at the getting started page
The Comala Workflows API enables other confluence plugins to interact with Comala Workflows to enquire about and manipulate states, task and approvals information and to get notification of workflows events.
Ready to go? Have a look at the Getting Started page, or jump straight into the documentation: https://comalatech.bitbucket.io/comala-workflows/index.html
All the workflow information is associated to Pages and Blog posts. The higher level entity is a State, which can be assigned, and contains Tasks, Approvals and Rejections.