MIGS  (real-time) Response Codes:

Transaction Responses   

Code	Type	Message	CSI Pay Code
0	Good	Transaction Successful	A01
9	Soft	Bank Declined Transaction (Do not contact Bank)	D01
5	Soft	Transaction Declined - Insufficient funds	D03
7	Hard	Payment Server Processing Error	D05
U	Soft	Card Security Code Failed	D08
I	Soft	Card Security Code Failed	D08
L	Soft	Shopping Transaction Locked	D09
R	Soft	Retry Limits Exceeded, Transaction Not Processed	D15
4	Hard	Transaction Declined - Expired Card	D16
A	Hard	Transaction Aborted	D27
E	Hard	Issuer Returned a Referral Response	D27
8	Hard	Transaction Declined - Transaction Type Not Supported	D27
C	Hard	Transaction Cancelled	D27
F	Hard	3D Secure Authentication Failed	D27
N	Hard	Cardholder is not enrolled in 3D Secure (Authentication Only)	D27
S	Hard	Duplicate OrderInfo used	D27
D	Hard	Deferred Transaction	D27
?	Hard	Response Unknown	D27
P	Hard	Transaction is Pending	D27
2	Soft	Bank Declined Transaction	D30
1	Soft	Transaction Declined - Bank Error	D30
3	Soft	Transaction Declined - No Reply from Bank	D34
6	Soft	Transaction Declined - Error Communicating with Ban	R09

CSC Responses   

Code	Message	CSI Pay Code
M	Valid or matched CSC	M
N	Code invalid or not matched	N
P	CSC Not Processed	P
S	Merchant indicates CSC not present on card	S
U	Card issuer is not registered and/or certified	U