How to implement Opt-Out Management? SMS Campaigns support optouts by default, to use optout features in third party applications addressbook documentation can be used.
For information about Opt-Out Management API calls please see OptOut under the documentation in below link;
Addressbook can dump Opt-Out list filtered groups/contacts. Also filtered list can be retrieved as a CSV file.
For information about Addressbook API Dump calls please see Dump under the documentation in below link;