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  • The first time a browser or device appeared in your application.
  • The most recent identification before the current event.
These timestamps when combined with Smart Signals (e.g. IP Geolocation, etc) can be valuable in detecting account takeover and other fraud.

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Availability

Visitor footprint timestamps are available for all plans at no additional cost. These fields are included in:

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Representation in API response

In API responses, visitor footprint timestamps are represented by the following JSON properties:
  1. identification.first_seen_at
  2. identification.last_seen_at
last_seen_at contains the previous identification timestamp. For a visitor’s first identification, it equals first_seen_at. 
{
  // ...
  // Timestamps are Unix millisecond integers
  "identification": {
    "first_seen_at": 1647430261101,
    "last_seen_at": 1648118914023
  },
  // ...
}
Identifying users in hybrid app frameworks Changelog (Android SDK)