OptionalamountOptionalexpandSpecifies which fields in the response should be expanded.
OptionalmetadataSet of key-value pairs that you can attach to an object. This can be useful for storing additional information about the object in a structured format. Individual keys can be unset by posting an empty value to them. All keys can be unset by posting an empty value to metadata.
A positive integer, in cents (or local equivalent), representing how much of this fee to refund. Can refund only up to the remaining unrefunded amount of the fee.