Identity Resolution ExternalIDs

Default ExternalIDs

The Identity Graph creates or merges profiles based on externalIDs. ExternalIDs will become the Identities attached to a User Profile in the User Explorer:

We automatically promote the following traits and IDs in track and identify calls to externalIDs:

External ID Type Message Location in Track or Identify Call
anonymous_id anonymousId
user_id userId
group_id groupId
cross_domain_id cross_domain_id
email traits.email or context.traits.email
android.id context.device.id when context.device.type = ‘android’
ios.id context.device.id when context.device.type = ‘ios’
android.push_token context.device.token when context.device.type = ‘android’
ios.push_token context.device.token when context.device.type = ‘ios’
android.idfa context.device.advertisingId when context.device.type = ‘android’ AND context.device.adTrackingEnabled = true
ios.idfa context.device.advertisingId when context.device.type = ‘ios’ AND context.device.adTrackingEnabled = true
ga_client_id context.integrations[‘Google Analytics’].clientId when explicitly captured by users

Custom ExternalIDs

Personas will automatically resolve identity for any other externalIDs that you bind to users - such as a phone number or any custom identifier that you support. As seen in the below example, you can send custom externalIds in the context object of any call to our API.

analytics.track('Subscription Upgraded', {
   plan: 'Pro',
   mrr: 99.99
}, {
  externalIds: [
    {
      id: '123-456-7890',
      type: 'phone',
      collection: 'users',
      encoding: 'none'
    }
  ]
})

Personas will automatically create a user (user_id: use_123) with the custom externalId (phone: 123-456-7890). Then, you query the users phone record by using the external id (phone: 123-456-7890), or update this profile using that externalId going forward. (Note: externalIDs must be lower-case.)

Viewing Promoted ExternalIDs

Users can view which externalIDs are promoted on each event by viewing the raw payload on Events in the User Profile in the “external_ids” object.

For example, the following user had anonymous_id and user_id promoted as identifiers from the Course Clicked track call:

Example

Let’s say a new anonymous user visits your Pricing page:

analytics.page('Pricing', {
  anonymousId: 'anon_123'
  title: 'Acme Pricing',
  url: 'https://acme.com/pricing',
  referrer: 'https://google.com/'
});

At this point, the Identity Graph will create a new user with external id (anonymous_id: anon_123) and a persistent and globally unique segment_id, in this case: use_4paotyretuj4Ta2bEYQ0vKOq1e7.

Any new events received with the same external id (anonymous_id: anon_123) will be appended to same user use_4paotyretuj4Ta2bEYQ0vKOq1e7.

Next, the user goes to a signup form and signs up:

analytics.track('User Signup', {
  userId: 'use_123',
  anonymousId: 'anon_123'
});

At this point, the Identity Graph associates external ID (user_id: use_123) with the same user use_4paotyretuj4Ta2bEYQ0vKOq1e7.


Get started with Segment

Segment is the easiest way to integrate your websites & mobile apps data to over 300 analytics and growth tools.
or
Create free account