code: def page_index(self, page_index):
          
  
          if page_index is None:
              raise ValueError("Invalid value for `page_index`, must not be `None`")
          if page_index > 6:
              raise ValueError("Invalid value for `page_index`, must be a value less than or equal to `6`")
          if page_index < 0:
              raise ValueError("Invalid value for `page_index`, must be a value greater than or equal to `0`")
  
          self._page_index = page_index
docs: Sets the page_index of this V1Page.
          The page's position in the merchant's list of pages. Always an integer between 0 and 6, inclusive.
  
          :param page_index: The page_index of this V1Page.
          :type: int