Return Codes Below table lists return codes after unsuccessful call to a webservices operation. Successful operation will return an OK data in the response message. Please note that by default the response message is a JSON encoded message. Error code Description ERR 100 authentication failed ERR 101 type of action is invalid or unknown ERR 102 one or more field empty ERR 103 not enough credit for this operation ERR 104 webservice token is not available ERR 105 webservice token not enable for this user ERR 106 webservice token not allowed from this IP address ERR 200 send message failed ERR 201 destination number or message is empty ERR 400 no delivery status available ERR 401 no delivery status retrieved and SMS still in queue ERR 402 no delivery status retrieved and SMS has been processed from queue ERR 501 no data returned or result is empty There might appear new error codes in the future. You should be aware that new codes might appear in this syntax: Error code Description ERR 1xx authentication or parameter erorrs ERR 2xx specific pv errors ERR 4xx delivery status errors ERR 5xx others