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I am submitting ECC refund with full credit card number and expiration date with no transaction ID. And yet I get a response code 33 with error message "A valid referenced transaction ID is required.".I am using C# with SDK.

If I pass in empty string for cardCode, response returns as null. I thought Authorize.NET always returns some kind of response.. var creditCard = new creditCardType { cardNumber = "4111111111111111", expirationDate = "1028",cardCode = “” }; var payme...