source: app/Models/Transaction.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Laravel\Cashier\Subscription as CashierSubscription;

class Transaction extends Model
{
    use HasFactory;

    protected $table = 'transactions';

    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'name',
        'stripe_id',
        'stripe_price',
        'quantity',
        'offer_id',
        'invoice_id',
    ];

    /**
     * The attributes that should be cast.
     *
     * @var array<string, string>
     */
    protected $casts = [
        'trial_ends_at' => 'datetime',
        'ends_at' => 'datetime',
    ];

    public function offer(): BelongsTo
    {
        return $this->belongsTo(Offer::class);
    }
}