What are Facebook's requirements for shipping weights?

The module can export weight in g:shipping_weight, using the weight on the product page and the unit configured in PrestaShop. It outputs that unit in lowercase.

Check the value and shop unit together: a correct number paired with an incorrect unit produces the wrong weight. Regenerate the feed and inspect what is actually sent for the item.

Accepted units depend on the applicable Meta specifications. Consult the official reference before converting or changing the unit for the whole shop; that change may also affect other calculations and carriers.

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