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

• For the contact keys, you need to have a contact attribute identified as key. You are responsible for generating and maintaining the keys.
• 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
• Create contacts
• Import contacts from CSV
• Update contacts
• Delete contacts