mivita/app/Rules/TurnstileToken.php

<?php

namespace App\Rules;

use App\Services\TurnstileVerifier;
use Closure;
use Illuminate\Contracts\Validation\ValidationRule;
use Illuminate\Translation\PotentiallyTranslatedString;

class TurnstileToken implements ValidationRule
{
    public function __construct(private ?string $ip = null) {}

    /**
     * @param  Closure(string, ?string=): PotentiallyTranslatedString  $fail
     */
    public function validate(string $attribute, mixed $value, Closure $fail): void
    {
        if (! is_string($value) || ! app(TurnstileVerifier::class)->verify($value, $this->ip)) {
            $fail(__('form_protection.captcha_failed'));
        }
    }
}