The Profiles API allows you to manage the profile information associated with an individual recipient.
recipient_id is a unique identifier for a recipient. This can be any string of your choosing. Be sure to choose a value that does not change. This prevents duplicate entries in the event that a recipient changes their email or some other identifying value. Typically, user ID values from your system make for good recipient_id's.
profile is a JSON object that includes any key-value pairs required by our Integrations. You can find the required keys for any Integration on its "Integrations" page. See the "Integration Introduction" for details.