If you want to automate certain actions, like opt in / opt out responses, you can easily do this with Flow Builder; you can learn how to set this specific flow here.
When sending out a campaign, make sure your contacts are in a group.
If you configure a rule like the one shown below, those users who reply ‘Stop’ will be automatically removed from the group specified:
This will remove the contacts from the group, but they will remain in your address book.
You can also create multiple flows for one Number, allowing you to trigger different actions depending on pre-specified keywords within the response of the user.
A company could use this to keep track of customers who are interested in a certain offer. For example: if you send ‘Reply SPA to enter our prize draw’, and want to keep all the replies for this offer in one place, you can set up something like this:
The relevant replies would be automatically forwarded to a phone, email or added to a group, or you could even configure an automatic response.
There is no limit to how many contacts can send you to opt in or opt out responses