Hi My card is declined in the production environemnt. getting the message DECLINED * SYSTEM PROBLEM =CANNOT PROCESS*PLEASE RETRY. I had tried with multiple cards. Please let me know what can be the issue here

Hi My card is declined in the production environemnt.  getting the message DECLINED           * SYSTEM PROBLEM     =CANNOT PROCESS*PLEASE RETRY. I had tried with multiple cards. Please let me know what can be the issue here