To manage subscribers, simply use the Manage subscribers node, select one of your previously created Opt-in. Once your users accepts it they will have it associated with their phone number and will be eligible for future campaigns.
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Need some inspiration? Check out our β Sign up/opt-in flows template
Global opt-out flow
To help your flows stay GDPR compliant, we recommend setting up a global opt-out flow using the Manage subscribers node.
Check it out here: Global opt-out flow