Possible reasons why a transaction was rejected by the gateway.
enum GatewayRejectionReason {
APPLICATION_INCOMPLETE
AVS
AVS_AND_CVV
CVV
DUPLICATE
EXCESSIVE_RETRY
FRAUD
MANUAL_TRANSACTIONS_DISABLED
PAYMENT_METHOD_BLOCKED
RISK_THRESHOLD
THREE_D_SECURE
TOKEN_ISSUANCE
TOO_MANY_CONFIRMATION_ATTEMPTS
UNION_PAY_ENROLLMENT_REQUIRED
}