Hello again!
Sure thing, we're happy to help! And thank you for clarifying that you are using the standalone SMS API.
The product teams got back to me. In addition to using your own backend processes to extract and act upon the content of an MO message, the SMS API also allows you to create, manage, and maintain groups of recipients. These groups can be set to automatically update using the auto_update property, allowing you to specify trigger responses that automatically opt recipients into or out of the group. You can send messages to groups of recipients that have opted in by simply including the corresponding group IDs in the the to property of the request. A thoughtful implementation of group functionality can therefore streamline your opt-in and opt-out processes.
In order to use the auto_update property, you'll need a valid phone number or short code which has been provisioned by your account manager. If you have any other questions, please let us know.
Thank you!
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