Log into the morethan160, click your username from the top right button and select 'Your Account'.
Scroll and open 'Advanced'.
- SMS callback (returns messageID)
- optout (returns the userID that opts out of campaigns)
- survey response (json data of survey submited by user)
Enter your URLs that will accept the call back after an morethan160 event.
Documentation of the JSON content returned to callback URL can found on the morethan160 API documentation.