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Refund amount breakdown
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An object that contains short summary on what a refund consists of.

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Field name  Type                                                                Description
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total       :doc:`amount`                                                       The total refund amount.
by_tickets  List of {``product_name``: :doc:`i18n`, ``amount``: :doc:`amount`}  How much it was refunded for each ticket.
other       :doc:`amount`                                                       All the rest of the total refund amount except the per-ticket refunds
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