SATE-EasyReceipt/app/Rules/CustomerCode.php

<?php

namespace App\Rules;

use App\Models\Htpms\MstCustomer;

class CustomerCode extends BaseRule
{

    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
    }
    
    
    public function check($value) : bool
    {
        return MstCustomer::customerCode($value)->exists();
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return trans('validation.exists');
    }
}