Client.php

<?php

declare(strict_types=1);

namespace Passport\Models;

use Closure;
use Laravel\Passport\Client as PassportClient;
use Ramsey\Uuid\Uuid;

class Client extends PassportClient
{
    /**
     * Indicates if the IDs are auto-incrementing.
     *
     * @var bool
     */
    public $incrementing = false;
    
    /**
     * The "type" of the primary key ID.
     *
     * @var string
     */
    protected $keyType = 'string';
    
    /**
     * The "booting" method of the model.
     *
     * @return void
     */
    protected static function boot() : void
    {
        parent::boot();
        
        static::creating(Closure::fromCallable([static::class, 'generateAndAssignId']));
    }
    
    /**
     * @param \Passport\Models\Client $client
     */
    private static function generateAndAssignId(Client $client) : void
    {
        if ($client->id !== null) {
            return;
        }
        
        $client->id = Uuid::uuid4()->toString();
    }
}