Get agency custom area boundary used in creating an agency post.

This API requires the following scopes:

• agency.boundary:read

If enable_pagination is true, the output will be:

        """
        cursor: None
        has_next_page: False
        result: [{'name': 'City Agency x', 'group_id': x, 'geometry': '{ "type": "MultiPolygon", "coordinates": [x, ] }'}]
        """