get item detail through ebay api

I am aim to get item detail (name, category, even price) through ebay api, JSON format.

Here is a sample item searched by ebay, EAN barcode 0705632085943:
https://www.ebay.co.uk/sch/i.html?_osacat=0&_odkw=0705632085943&_from=R40&_trksid=m570.l1313&_nkw=0705632085943&_sacat=0

I had read this page released by ebay: getProductDetails :
https://developer.ebay.com/devzone/product/CallRef/getProductDetails.html

So in my project, I used:

http://svcs.ebay.com/services/search/FindingService/v1?OPERATION-NAME=getProductDetails&SERVICE-VERSION=1.0.0&SECURITY-APPNAME=My-App-Name&RESPONSE-DATA-FORMAT=JSON&productDetailsRequest.productIdentifier.EAN = 5053826000186

But, back with:

{"errorMessage":[{"error":[{"errorId":["2000"],"domain":["CoreRuntime"],"severity":["Error"],"category":["Request"],"message":["Service operation getProductDetails is unknown"],"subdomain":["Inbound_Meta_Data"],"parameter":[{"@name":"Param1","__value__":"getProductDetails"}]}]}]}

I known little about web-language and started with Swift. Does there has any feasible advice in dealing with this?