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Set the Subscriber Key or Contact Key
Contact key, also known as subscriber key, is the unique identifier used to aggregate a contact’s devices in Marketing Cloud Engagement. Set the contact key to a specific value provided by your customer or to another unique identifier for the contact. You can use a mobile number, customer number, Salesforce ContactID, or another value.
For specific details on how to set the contact key for Android and iOS apps, see Register Contacts with Marketing Cloud Engagement.
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