I have received a message that my package cannot be processed because my transaction was declined. What does that mean?

Our credit/debit card processor does not tell us what is wrong with a transaction, only that the card information provided was declined. The reasons could be any of the following: too many uses as seen by your bank; over the credit limit; fraud; or the bank’s own security profile system not liking something. All we know from our end is that a charge is accepted or denied and yours was denied.