code: def get_collection(self, collection_id=None, nav="children", page=None):
          
          return self.call(
              "collections",
              {
                  "id": collection_id,
                  "nav": nav,
                  "page": page
              },
              defaults={
                  "id": None,
                  "nav": "children",
                  "page": 1
              }
          )
docs: Makes a call on the Collection API
  
          :param collection_id: Id of the collection to retrieve
          :param nav: Direction of the navigation
          :param page: Page to retrieve
          :return: Response
          :rtype: requests.Response