...
(1) either email or sms parameter must be specified
(2) if blank, default value for the list will be used
(3) for further details on how to use these fields, please see the section about the "subscribe.aspx" API (top of this page)
RETURNED VALUES:
CODE | DESCRIPTION |
0 | Operation completed successfully / User already subscribed |
1 | Generic error |
2 | Invalid email address or mobile number |
...