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This only applies to customers using Vero’s own Javascript API Library or Segment.com’s Analytics.js Javascript library. Sometimes you will track and cookie a customer using a random identifier, or their email address, and later you will want to update this value with a unique identifier (ID) from your own database or system.

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Re-indentify

For example, if you had called the identify method and tracked a customer with the email tyrion.lannister@casterlyrock.com as a subscriber on your blog but, after they signed up for your free trial, wanted to identify them with your database identifier of 1285 , you can use Vero’s re-identify method to update the customer’s profile. To learn about the re-identify (or alias) method in detail, refer to our API Reference Documentation. An example of the re-identify method is below: 
<script>
        _veroq.push(['reidentify', '1285']);
    </script>

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Segments alias

Segment’s alias method works in the same way. Vero is the only email marketing platform that works with Segment and provides an alias method, giving you a lot of power and flexibility over how your customers are tracked.