I am trying to download the 'Detail Page Sales and Traffic' and 'Detail Page Sales and Traffic By Child Item' automatically. Because manual pulling takes extra effort to complete this job. Also scraping option is not possible.So if there is any way to pull using MWS Api.
As far as I can tell, this report (and many others) are not available via the MWS API. The only reports available via MWS are the ones listed here:
https://docs.developer.amazonservices.com/en_US/reports/Reports_ReportType.html