code: def init_app(self, app,
                   entry_point_group='invenio_workflows.workflows',
                   **kwargs):
          
          app.config.setdefault(
              "WORKFLOWS_OBJECT_CLASS",
              "invenio_workflows.api.WorkflowObject"
          )
          state = _WorkflowState(
              app, entry_point_group=entry_point_group, **kwargs
          )
          app.extensions['invenio-workflows'] = state
          return state
docs: Flask application initialization.