Question about Sharepoint online ExcelService

Question

Recently, I want to develop a customize app which need to get& save data from Excel which hosted on Sharepoint online. So I should use ExcelService web service(SOAP API). But when I use ExcelService.OpenWorkBook function based on Microsoft's guide,
system reports an error- "We couldn't find the file you wanted". Here is my code:
            Status[] outStatue;
            RangeCoordinates ranngeCoordinates = new RangeCoordinates();
            string sheetname = "Summary";
            string targetWorkBookpath = "XXXX";
            es.Credentials = new System.Net.NetworkCredential(userName, securePwd, "XXX.sharepoint.com");
            es.SoapVersion = SoapProtocolVersion.Soap12;
            string sessionId = es.OpenWorkbook(targetWorkBookpath, "en-US", "en-US", out outStatue);
So could you help me know:
1. Whether Sharepoint online supports ExcelService web service(SOAP API), or whether can I get/save excel data by using ExcelService web service?
2. Could you please provide me some related material or web reference to help me learn how can I get/save excel data by using ExcelService web service.
3. Because Sharepoint online is based on Office 365, so it's mapped to Https, I guess system need do user authentication, how can I can do it in my code. 

Answer 1

try these links:
http://stackoverflow.com/questions/27810229/using-excel-services-on-sharepoint-online
https://social.technet.microsoft.com/Forums/en-US/e85ea9b8-68e3-4d0d-9421-6e9424a57ab4/excel-web-access-error-when-i-click-browse-button-beside-workbook?forum=sharepointadmin
http://blog.sharepointsite.co.uk/2014/01/office-web-app-ran-into-problem-opening.html
https://curah.microsoft.com/66407/were-sorry-we-ran-into-a-problem-completing-your-request-please-try-that-again-in-a-few-minutes
yes it supports excel web services api below links is useful:
http://blogs.office.com/2013/12/17/excel-rest-api-in-sharepoint-online/
http://msdn.microsoft.com/en-us/library/office/ff640648%28v=office.14%29.aspx