code: def verify_message(self, message):
          
          if verify_checksum(
                  message,
                  self.in_checksum.get(message.id, 0),
          ):
              self.in_checksum[message.id] = message.checksum[1]
  
              if message.flags == FlagsType.none:
                  self.in_checksum.pop(message.id)
          else:
              self.in_checksum.pop(message.id, None)
              raise InvalidChecksumError(
                  description="Checksum does not match!",
                  id=message.id,
              )
docs: Verify the checksum of the message.