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## JS Tracker — document `EXT_ID` in `Brevo.identify()`

Added a "Passing an external identifier (EXT_ID)" section to the JS tracker's `identify()` guide showing how to pass `EXT_ID` as an attribute alongside `email_id`. The same pattern applies to `SMS`, `WHATSAPP`, and `LANDLINE_NUMBER`.

**Guide updated:**

[Identify users (JS)](/docs/identify-users-js)