Is there a way to find items just by querying in url? Also how can I parse my API credentials and other needed headers in C#? It's not that I don't know how to use headers in C# but I can't find anything in documentations that I can use for example. All I need is searching for items by keywords. I have been going trough documentation and can't find anything. So to sum all I need: 1) example of url for parsing keywords as query with url 2) all headers I need And last thing. Can I get result in JSON instead of XML? Thank you.
Yes, with the Finding API (such as findItemsAdvanced call), you can build your API request in a REST/GET URL, no headers needed. And yes, you can get XML or JSON returned as the response. Sorry, I'm not familiar with C# nomenclature. Here're the docs for fIA:
http://developer.ebay.com/DevZone/finding/CallRef/findItemsAdvanced.html If you scroll down into it a bunch, you'll see "URL format" for building requests in that way. If you want to stick with POSTing your request in XML, you can do so, and you'll need to send headers. In addition to the docs page above, here's info on making a basic Finding API call. You'll see header details in there.