It's an Additional Shipping Fees or Taxes. Sometimes Amazon receives some extra shipment costs or taxes for the delivery into the different US nations. It may happen on your Bitoff profile that these extra fees are not included in your order, so you need to add these extra amount on Extra Fee box manipulatively.

For example, the item shows $175.00, but an extra 4.49 dollars is needed for the shipping cost. Usually they are included on your order list on Bitoff, but if it wasn't, you need to add it.
In case you don't enter the extra fee amount, Earners may not accept or purchase your order. Earners usually don't pay the additional shipping costs if it hasn't been calculated already on the order list, especially when the item is large with an expensive shipping costs.

In case your product has additional fees but you missed to enter the amount on the extra fee box, Earners may fail to fulfill your order.

It's easy to tell if an item requires additional shipping costs or not, by adding the item to your Amazon's basket card you can figure out the shipping cost and taxes fees before submitting your order on Bitoff.

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