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Update externalids.md #6582

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Update externalids.md #6582

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3 changes: 3 additions & 0 deletions src/unify/identity-resolution/externalids.md
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Expand Up @@ -36,6 +36,9 @@ Segment automatically promotes the following traits and IDs in track and identif
> note ""
> The Google clientID(ga_clientid) is a unique value created for each browser-device pair and will exist for 2 years if the cookie is not cleared. The analytics.reset() call should be triggered from Segment end when the user logs off. This call will clear the cookies and local Storage created by Segment. It doesn’t clear data from other integrated tools. So on the next login, the user will be assigned with a new unique anonymous_id, but the same ga_clientid will remain if this cookie is not cleared. Hence, the profiles with different anonymous_id but with same ga_clientid will get merged.

> > note2 ""
> Make sure to lower case the identifier you're parsing to Unify when applicable. Duplicates issues might occurr. Only identifiers under traits objects has an auto lower-case logic.

## Custom externalIDs

Unify resolves identity for any other externalIDs that you bind to users - such as a phone number or any custom identifier that you support.
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