Hi Mabel, I tried your method, but I got the attached error and below.
{ "Pragma": "no-cache", "x-ms-request-id": "95ebe022-498d-466a-8763-a213f7fc9c9c", "Timing-Allow-Origin": "*", "Cache-Control": "no-cache", "Date": "Wed, 26 Apr 2017 13:03:08 GMT", "Set-Cookie": "ARRAffinity=088b929beac32154b04bc796b6da72237f2838d0102b333dc5f9719d2366e6d5;Path=/;Domain=127.0.0.1", "Server": "Microsoft-IIS/8.0,Microsoft-HTTPAPI/2.0", "X-AspNet-Version": "4.0.30319", "X-Powered-By": "ASP.NET", "Content-Length": "213", "Content-Type": "application/json; charset=utf-8", "Expires": "-1" }
{ "status": 400, "message": "User value is invalid.", "source": "(SITEURL)/SP.APIHubConnector.UpdateListItem", "errors": [ "-1", "Microsoft.SharePoint.SPConnectorException" ] }