invoiceninja/app/Models/ClientSubscription.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;

class ClientSubscription extends BaseModel
{
    use HasFactory;

    protected $fillable = [
    	// 'subscription_id',
    	// 'recurring_invoice_id',
    	// 'client_id',
    	// 'trial_started',
    	// 'trial_ends',
    	// 'is_deleted',
    ];

    protected $casts = [
        'is_deleted' => 'boolean',
        'updated_at' => 'timestamp',
        'created_at' => 'timestamp',
        'deleted_at' => 'timestamp',
    ];

    public function company(): \Illuminate\Database\Eloquent\Relations\BelongsTo
    {
        return $this->belongsTo(Company::class);
    }

    public function recurring_invoice(): \Illuminate\Database\Eloquent\Relations\BelongsTo
    {
        return $this->belongsTo(RecurringInvoice::class);
    }

    public function client(): \Illuminate\Database\Eloquent\Relations\BelongsTo
    {
        return $this->belongsTo(Client::class);
    }

    public function subscription(): \Illuminate\Database\Eloquent\Relations\BelongsTo
    {
        return $this->belongsTo(BillingSubscription::class);
    }
}