View Source GoogleApi.Content.V21.Model.OrdersCustomBatchRequestEntryRefundItemItem (google_api_content v0.61.1)
nil) - The total amount that is refunded. (e.g. refunding $5 each for 2 products should be done by setting quantity to 2 and amount to 10$) In case of multiple refunds, this should be the amount you currently want to refund to the customer.
nil) - If true, the full item will be refunded. If this is true, amount should not be provided and will be ignored.
nil) - The ID of the line item. Either lineItemId or productId is required.
nil) - The ID of the product. This is the REST ID used in the products service. Either lineItemId or productId is required.
nil) - The number of products that are refunded.