Validation is ready.

src/CaptchaProvider.php

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+<?php declare(strict_types=1);
+
+namespace korElf\CaptchaRuleForLaravel;
+
+use Illuminate\Support\Facades\Validator;
+use Illuminate\Support\ServiceProvider;
+use Illuminate\Support\Facades\Blade;
+use Illuminate\Contracts\Foundation\Application;
+
+final class CaptchaProvider extends ServiceProvider
+{
+    public function boot(): Void
+    {
+        $this->addValidationRule();
+        $this->publishes([
+            __DIR__ . '/../config/captcha.php' => config_path('captcha.php'),
+        ], 'config');
+
+        if (config('captcha.enable_blade_captcha')) {
+            Blade::directive('captcha', function () {
+                return "<?php echo \korElf\CaptchaRuleForLaravel\htmlCaptcha(); ?>";
+            });
+        }
+    }
+
+    /**
+     * Extends Validator to include a captcha type
+     */
+    public function addValidationRule(): Void
+    {
+        $message = trans(config('captcha.error_message_key'));
+        Validator::extendImplicit(config('captcha.rule_name'), function ($attribute, $value) {
+            if (!is_string($value)) {
+                return false;
+            }
+            return app(CaptchaService::class)->validate($value, request()->userAgent());
+        }, $message);
+    }
+
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register(): Void
+    {
+        $this->mergeConfigFrom(
+            __DIR__ . '/../config/captcha.php',
+            'captcha'
+        );
+
+        $this->app->singleton(CaptchaService::class, function (Application $app) {
+            return new CaptchaService(
+                privateToken: config('captcha.api_private_token', ''),
+                domainApi: config('captcha.api_domain', ''),
+                curlTimeout: config('captcha.curl_timeout', ''),
+            );
+        });
+    }
+}

src/CaptchaService.php

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+<?php declare(strict_types=1);
+
+namespace korElf\CaptchaRuleForLaravel;
+
+use Illuminate\Support\Facades\Http;
+
+final readonly class CaptchaService
+{
+    public function __construct(
+        private string $privateToken,
+        private string $domainApi,
+        private int $curlTimeout = 10,
+    ) { }
+
+    public function validate(string $token, ?string $userAgent = null): bool
+    {
+        try {
+            $post = [];
+            if (!is_null($userAgent)) {
+                $post['user_ageng'] = $userAgent;
+            }
+
+            $response = Http::withHeaders([
+                'private-token' => $this->privateToken,
+            ])
+                ->timeout($this->curlTimeout)
+                ->post($this->domainApi . '/api/v1/captcha/' . $token, $post);
+
+            return ($response->json('status') === true);
+        } catch (\Throwable $e) {
+
+        }
+        return false;
+    }
+}

src/helpers.php

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+<?php declare(strict_types=1);
+
+namespace korElf\CaptchaRuleForLaravel;
+
+function htmlCaptcha(): string
+{
+    return '<div class="captcha-service-kor-elf" data-domain="' . config('captcha.api_domain') . '" data-static-path="' . config('captcha.static_path') . '" data-token="' . config('captcha.api_public_token') . '" data-captcha-verified-name="' . config('captcha.captcha_verified_name') . '"></div><script src="' . config('captcha.static_path') . '/script.js" async></script>';
+}