Update Clients Balance
Parameters:
                        Required : auth key, client_id, sms, accounttype, type, amount, descriptionOptional : none
Sample API
                    http://api.msg91.com/api/transfer_credit.php?authkey=YourAuthKey&client_id=client_id&sms=smsbalance&accounttype=accounttype&type=transactiontype&price=price&description=description
                        
                    Note:  Returns appropriate message 
                    Transaction Type
                        - Adding balance to client
 - Reducing balance from client