api.so-manager-dev.com/app/Models/CreditSubscription.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

/**
 * 継続課金会員登録モデル
 */
class CreditSubscription extends Model
{
    protected $table = 'credit_subscription';
    protected $primaryKey = 'credit_subscription_id';
    public $timestamps = true;

    protected $fillable = [
        'user_id',
        'credit_member_id',
        'credit_card_seq',
        'subscription_status',
        'registered_at',
        'operator_id',
    ];

    protected $casts = [
        'registered_at' => 'datetime',
        'subscription_status' => 'integer',
    ];

    /**
     * 利用者リレーション
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class, 'user_id', 'user_id');
    }
}