Identify User Id

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Every identified user must beigned a unique userId so they can be tracked consistently across different browsers or devices. When a new user registers, they . - Thoughigning User IDs is optional, we recommend that products with a login system or a UUID unique user identifier systemign a User ID. With a User ID, Amplitude can match events across multiple devices under the same user same User ID . Furthermore, a User ID does not need to beigned immediately..

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