[Klarna][Checkout v2] What is the purpose to pass the EANs (European Article Numbers) of the ordered products to Klarna?

Extensions Klarna
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https://developers.klarna.com/en/se/kco-v2/checkout-api#cart-item-object-properties

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I have got an answer from the Klarna’s support:

Since it’s an an optional field, you don’t need to pass it on.
It’s for the merchants that needs to have the EAN on the order.