Credit card rejection codes

What does that 2 digit rejection code mean.

[lgn1]

Is credit card rejection codes standard.

Im trying to differentiate between people who have given wrong expiry dates by mistake, vs people who
are temporary over their limit (try again in a couple of days) from deadbeats who had their credit cards suspended, or out right cases of fraud.

I noticed that the terminal generates a two digit
decline code, but I can't figure if it is standard
across the industry, unique to the card issuing company, or is dependent on the payment processor.

[jatar_k]

I am not 100% sure but I would think that it would be by payment provider. They would, at least, be the best people to ask. They may available documentation that would help.