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  1. Someone Subscribes using Catapult. You will use the Subscription Added Callback.
  2. Someone updates their preferences and personal data outside of Catapult. You would use the Update a Person API.
    Note: If there is custom data you want to store, custom fields need to be set up ahead of time.
  3. Someone Unsubscribes. You will 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.