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The following are some common situations where you can use a Vibes API or Callback.

1. When someone Subscribes using the Platform, you can use the Subscription Added Callback.
2. When someone updates their preferences and personal data outside of the Platform, you can use the Update a Person API.
   Note: If there is custom data you want to store, you need to set up the custom fields ahead of time.
3. When someone unsubscribes, you can use the Subscription Removed Callback.

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Note: When a Person adds a mobile number to your preference center, and you want to sign them up, you should go through the Web-Based Subscriber Management process as described in the previous scenario.

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