Shipping costs and delivery methods are defined by the channel. Contact it to obtain the table of costs.
Delivery methods
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Delivery.shippingRates.id: ID of the shipping rates your set in Allegro backoffice.
Free shipping option can be set in Allegro in "Free shipping section". More info here.
It can be difficult to find the ID of values you've created in your Allegro back-office, please read this step to know how to do it. - handlingTime: (mandatory) Estimated time for deliver.