exchange-2.0/app/Models/CurrencyRate.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\SoftDeletes;

class CurrencyRate extends AbstractModel
{
    use SoftDeletes;

    protected $table = 'currency_rates';

    protected $fillable = ['currency_id', 'selling', 'payment_method_type'];

    protected $dates = ['deleted_at'];
}