Errorcode 1, 2, 4 are errorcodes for credit card payments which have been declined by the issuer (bank that issued the credit card to the customer).
The customer / card holder may contact the issuing bank for details of declining the transaction.
Errorcode 5 is an errorcode for credit card payments which have been declined by the issuer (bank that issued the credit card to the customer).
It's a general errorcode for blocked transactions - blocked by the issuer. And it's the most common one for credit card payments.
Errorcode 7 is an errorcode for credit card payments which have been declined by the issuer (bank that issued the credit card to the customer).
The account has been flagged as fraudulent or the card has been reported as stolen.