Visitors are anonymously tracked using session ids throughout your site. But when visitors identify themselves at login, signup or checkout, you may pair a session id with a user to identify the entire chain of events one user has carried out over time.

/* Identify a user */
zlt.track('user', {
    'user_id':'[email protected]',
    'email':'[email protected]',

The user_id should be a unique identifier. It can be an email address or any other identifier of choice.

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