example-code/php-laravel/app/Models/User.php

<?php

namespace App\Models;

use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
use App\Models\Order;
use App\Models\Transaction;
use App\Models\Ticket;
use Laravel\Cashier\Billable;

class User extends Authenticatable implements MustVerifyEmail
{
    use HasFactory, Notifiable, Billable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name',
        'email',
        'password',
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password',
        'remember_token',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];

	public function orders() {
		return $this->hasMany(Order::class);
	}

	public function transactions() {
		return $this->hasMany(Transaction::class);
	}

	public function tickets() {
		return $this->hasMany(Ticket::class);
	}

}