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Custom fee
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The Custom Fee entity provides details about an additional charge that can be incorporated into the service costs section of a bill.

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Field name         Type                  Description
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uid                 String               A machine-readable ID assigned to this specific custom fee, primarily used for API communication.
amount              :doc:`amount`        The overall cost of the custom fee, determined by multiplying the unit price by the quantity.
unit_price          :doc:`amount`        The cost per unit of the custom fee.
label               :doc:`i18n`          The designated name for the custom fee.
quantity            Number               The count of custom fees included.
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