docs: def transfer_image(self, image_id_or_slug, region_id):
          """
          This method allows you to transfer an image to a specified region.
  
          Required parameters
  
              image_id:
                  Numeric, this is the id of the image you would like to transfer.
  
              region_id
                  Numeric, this is the id of the region to which you would like to transfer.
          """
          if not image_id_or_slug:
              msg = 'image_id_or_slug is required to transfer an image!'
              raise DOPException(msg)
  
          if not region_id:
              raise DOPException('region_id is required to transfer an image!')
          params = {'region_id': region_id}
          json = self.request('/images/%s/transfer' % image_id_or_slug,
                              method='GET', params=params)
          status = json.get('status')
          if status == 'OK':
              return json.get('event_id')
          else:
              message = json.get('message')
              raise DOPException('[%s]: %s' % (status, message))