// ...

  var params = {
    RequestItems: {
      [process.env.DYNAMODB_TABLE_DATA]: requestItems
    }
  };

  console.log('params>>>', params);

  ddb.batchWriteItem(params, function(err, data) {
    if (err) {
      console.log("Error", err);
      callback(Error(err), {
        statusCode: 500,
        headers: {'Content-Type': 'text/plain'},
        body: 'Error encountered during record creation',
      });
    } else {
      console.log("Success", data);
      callback(null, {
        statusCode: 200,
        headers: {'Content-Type': 'text/plain'},
        body: requestItems.length.toString() + ' records successfully created',
      });
    }
  });
};