Giuliano,
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Where do I put the xml package ?
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web-root/Admin/XmlPackages
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What is the expected format ?
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have a look at the exchange rates xml packages already included. you will find them in the path mentioned above.
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How do I test if it is working ?
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check your currency table. debugging xml package will also be valuable to ensure data is coming in, and how to read data (xml format).
Sincerely,
Robert
GoVedia
Enterprise AspDotNetStorefront Development Partner
Web Design, Platform Enhancements & Managed Services