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Here is a sample written in C# using the .NET SDK (v715) for listing a fixed price item to the AU site item using the AddFixedPriceItem call.
This sample shows how to specify item specifics as name-value pairs for the listing. Whenever possible, it is recommended that the item be listed with item specifics.
Below is the code. Corresponding SOAP request is attached with this article.
/* 2012-2013 eBay Inc., All Rights Reserved */