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• Easily keep Catapult in sync with your most current Persons data.
• Have your system notified each time a Person is confirmed on a list or opts out of a list.
• Have your system notified when data is exchanged between the two systems. 

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Even though you use Catapult as your main Opt-in database, your CRM system contains your Subscriber data. Catapult does not collect additional data automatically, so you need to use APIs and Callbacks to communicate between your systems and Catapult.

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1. When someone Subscribes using Catapult, you can use the Subscription Added Callback.Image Added
2. When someone updates their preferences and personal data outside of Catapult, 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.

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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