Three-letter ISO currency code, in lowercase. Must be a supported currency.
OptionalexpandSpecifies which fields in the response should be expanded.
OptionalreferenceA description of the test funding. This simulates free-text references supplied by customers when making bank transfers to their cash balance. You can use this to test how Stripe's reconciliation algorithm applies to different user inputs.
Amount to be used for this test cash balance transaction. A positive integer representing how much to fund in the smallest currency unit (e.g., 100 cents to fund $1.00 or 100 to fund ¥100, a zero-decimal currency).