You need to make this HTTP request:
http://svcs.ebay.com/services/search/FindingService/v1?OPERATION-NAME=findItemsByKeywords &SERVICE-VERSION=1.0.0 &SECURITY-APPNAME=YOUR_APP_ID_HERE &RESPONSE-DATA-FORMAT=JSON &REST-PAYLOAD &keywords=harry%20potter%20phoenix
Source: eBay Search API Making an API Call
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