function userengage_script() {

    if( ! is_user_logged_in() ) {
        echo '<script data-cfasync="false">window.civchat = {apiKey: "2UO5RA",};</script>';
        echo '<script data-cfasync="false" type="text/javascript" src="https://widget.userengage.com/widget.js"></script>';
        return;
    }

    $user = get_user_by( 'id', get_current_user_id() );

    ?>
    <script data-cfasync="false" type="text/javascript">
      window.civchat = {
        apiKey: 'YOUR_API_KEY',
        name: "<?php echo $user->first_name . ' ' . $user->last_name ?>",
        user_id: "<?php echo $user->ID; ?>",
        email: "<?php echo $user->user_email; ?>"
      };
    </script>
    <script data-cfasync="false" type="text/javascript" src="https://widget.userengage.com/widget.js"></script>
    <?php

}

add_action( 'wp_head', 'userengage_script' );