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Important

Only level 0 (admin) is able to create metafields.

You need to send the user_id, so the API knows which user is associated to the cart_id

Any metafield key that starts with the prefix extra_value_ will be subtracted or added to the total amount of the cart if the value is an integer or decimal.

If you need more information related to Metafields Extra attributes, please click on the link below.
Extra attributes (Metafields)