易趣API - 按特定网址检索图片

I would like to ask you. How to retrieve image by the specific URL (that I already have)? I found a lots of articles about how to retrieve images and items by some keywords etc. but I don't need that search.

I tried to make a crawler to get the image, but it's impossible until I don't use the ebay API (the url to image is hidden).

Is it possible to retrieve images even if I don't want to use ebay AppID, so just somehow crawl the page?

I am not sure what solutions I can get, but I need to use it with PHP

Here is an example of how to get the pictures via the API, just replace your appid and the item id you want (the pictures are in Item->PictureURL):

http://open.api.ebay.com/shopping?callname=GetSingleItem&responseencoding=JSON&appid=YOURAPPID&siteid=0&version=939&ItemID=ITEMID