CVV is the security code on the front or back of the credit card. This transaction increases the authentication for a card-not-present transaction without holding funds.
For testing, set the following fields after selecting the "Try It" button
externalReferenceID = Unique record identifier for processing - you assign Numeric Min = 16 Max 19
transactionDate = Set to UTC timezone, Format 2020-09-15T17:01:01
Link to UTC time = https://time.is/UTC