code: def metadata(dataset, node, entityids, api_key=None):
      
  
      payload = {
          "apiKey": api_key,
          "datasetName": dataset,
          "node": node,
          "entityIds": entityids
      }
  
      return json.dumps(payload)
docs: The use of the metadata request is intended for those who have
      acquired scene IDs from a different source. It will return the
      same metadata that is available via the search request.
      
      :param dataset:
      
      :param node:
      
      :param sceneid:
      
      :param api_key: