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I am making the following request:
http://open.api.ebay.com/shopping?appid=<appid>&version=575&siteid=0&callname=FindHalfProducts&ProductID.type=ISBN&ProductID.value=0307387895&IncludeSelector=Details
And I get the same item twice in my response as below:
<?xml version="1.0" encoding="utf-8"?>
<FindHalfProductsResponse xmlns="urn:ebay:apis:eBLBaseComponents">
<Timestamp>2008-08-21T20:33:10.718Z</Timestamp>
<Ack>Success</Ack>
...
<TotalProducts>1</TotalProducts>
<Products>
<Product>
<Title>Harry Potter and the Deathly Hallows by J. K. Rowling (2007)</Title>
...
+ <ShippingCostSummary>
...
<ProductID type="Reference">59049480</ProductID>
<ProductID type="ISBN">0545010225</ProductID>
<ProductID type="ISBN">9780545010221</ProductID>
<DomainName>Children's Books</DomainName>
+ <ItemSpecifics>
<ItemArray>
<Item>
<ItemID>340755552420</ItemID>
<ViewItemURLForNaturalSearch>http://product.half.ebay.com/Harry-Potter-and-the-Deathly-Hallows-J-K-Rowling-Hardcover-2007_W0QQprZ59049480QQtgZvidetailsQQitemZ340755552420</ViewItemURLForNaturalSearch>
<Location>Sparks, NV</Location>
+ <Seller>
<CurrentPrice currencyID="USD">4.73</CurrentPrice>
+ <Storefront>
<Country>US</Country>
<HalfItemCondition>Good</HalfItemCondition>
<SellerComments>Good (Airport Place Books does not ship on Saturdays and Sundays. We are unable o</SellerComments>
</Item>
…..
<Item>
<ItemID>340755552420</ItemID>
<ViewItemURLForNaturalSearch>http://product.half.ebay.com/Harry-Potter-and-the-Deathly-Hallows-J-K-owling-Hardcover-2007_W0QQprZ59049480QQtgZvidetailsQQitemZ340755552420</ViewItemURLForNaturalSearch>
<Location>Sparks, NV</Location>
+ <Seller>
<CurrentPrice currencyID="USD">4.73</CurrentPrice>
+ <Storefront>
<Country>US</Country>
<HalfItemCondition>Used</HalfItemCondition>
<SellerComments>Good (Airport Place Books does not ship on Saturdays and Sundays. We are unable o</SellerComments>
</Item>
</ItemArray>
<ReviewCount>244</ReviewCount>
</Product>
</Products>
</FindHalfProductsResponse>
Summary
Currently, the call returns the same item twice in the response to indicate the item condition and whether it is used or new. In a future proejct, we are looking at improving the response so that the same item is not returned twice in the response.
Additional Info
Shopping API