You can identify contacts in your audience using their IDs (recommended) or addressable attributes (emails or phone numbers).

• For the IDs, you need to have a contact attribute identified as key. You are responsible for generating and maintaining the IDs.
• For the emails, you need a contact attribute identified as the EMAIL channel.
• For the phone numbers, you need a contact attribute identified as the SMS channel.

Related pages

• Query contacts
• Query a contact by ID
• Create contacts
• Update contacts
• Delete contacts