How to show custom user in alert

[FoxSecrets]

I have a custom table with more user information and I need to show his name from this table in alert, but have no idea how.

Currently the alert calls his username from XF user table. How to change this $user? Where does it come from?

Code:

{{ phrase('x_has_alerted_you', {
    'user': username_link($user, false, {'defaultname': $fallbackName})
}) }}

Code:

        $alertRepo->alert(
            $this->purchase->Receiver,
            $this->purchase->Sender->user_id...

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How to show custom user in alert

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