Cross-matching products when Rakuten's API hides the JAN

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Trying to compute "where is this product cheapest" across Rakuten's and Yahoo!'s APIs, you hit a wall before any price math: how do you decide two listings are the same product? The JAN (the product's barcode number) would make it easy — except the two marketplaces are asymmetric about it. Yahoo! Shopping: a jan_code parameter looks the JAN up directly, and the response carries janCode back. Rakuten item search: no JAN parameter.

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