diff --git a/.tests/php/integration/Mailchimp/FormTest.php b/.tests/php/integration/Mailchimp/FormTest.php
index 9a1ce6d1..e895ba52 100644
--- a/.tests/php/integration/Mailchimp/FormTest.php
+++ b/.tests/php/integration/Mailchimp/FormTest.php
@@ -5,10 +5,15 @@
  * @package HCaptcha\Tests
  */
 
+// phpcs:ignore Generic.Commenting.DocComment.MissingShort
+/** @noinspection PhpUndefinedClassInspection */
+
 namespace HCaptcha\Tests\Integration\Mailchimp;
 
 use HCaptcha\Mailchimp\Form;
 use HCaptcha\Tests\Integration\HCaptchaWPTestCase;
+use MC4WP_Form;
+use MC4WP_Form_Element;
 use Mockery;
 
 /**
@@ -18,11 +23,9 @@ class FormTest extends HCaptchaWPTestCase {
 
 	/**
 	 * Test add_hcap_error_messages().
-	 *
-	 * @noinspection PhpParamsInspection
 	 */
 	public function test_add_hcap_error_messages() {
-		$form = Mockery::mock( 'MC4WP_Form' );
+		$form = Mockery::mock( MC4WP_Form::class );
 
 		$messages = [
 			'foo' => [
@@ -86,46 +89,47 @@ public function test_add_hcap_error_messages() {
 
 	/**
 	 * Test add_captcha().
-	 *
-	 * @noinspection PhpParamsInspection
 	 */
 	public function test_add_captcha() {
-		$content    = '<input type="submit">';
-		$expected   =
+		$content  = '<input type="submit">';
+		$expected =
 			$this->get_hcap_form() .
 			wp_nonce_field( 'hcaptcha_mailchimp', 'hcaptcha_mailchimp_nonce', true, false ) .
 			'<input type="submit">';
-		$mc4wp_form = (object) [
-			'ID' => 5,
-		];
-		$subject    = new Form();
 
-		self::assertSame( $expected, $subject->add_captcha( $content, $mc4wp_form, null ) );
+		$mc4wp_form     = Mockery::mock( MC4WP_Form::class );
+		$mc4wp_form->ID = 5;
+
+		$element = Mockery::mock( MC4WP_Form_Element::class );
+
+		$subject = new Form();
+
+		self::assertSame( $expected, $subject->add_captcha( $content, $mc4wp_form, $element ) );
 	}
 
 	/**
 	 * Test verify().
-	 *
-	 * @noinspection PhpParamsInspection
 	 */
 	public function test_verify() {
 		$this->prepare_hcaptcha_verify_POST( 'hcaptcha_mailchimp_nonce', 'hcaptcha_mailchimp' );
 
+		$mc4wp_form = Mockery::mock( MC4WP_Form::class );
+
 		$subject = new Form();
 
-		self::assertSame( [], $subject->verify( [], null ) );
+		self::assertSame( [], $subject->verify( [], $mc4wp_form ) );
 	}
 
 	/**
 	 * Test verify() not verified.
-	 *
-	 * @noinspection PhpParamsInspection
 	 */
 	public function test_verify_not_verified() {
 		$this->prepare_hcaptcha_verify_POST( 'hcaptcha_mailchimp_nonce', 'hcaptcha_mailchimp', false );
 
+		$mc4wp_form = Mockery::mock( MC4WP_Form::class );
+
 		$subject = new Form();
 
-		self::assertSame( [ 'fail' ], $subject->verify( [], null ) );
+		self::assertSame( [ 'fail' ], $subject->verify( [], $mc4wp_form ) );
 	}
 }
diff --git a/src/php/Mailchimp/Form.php b/src/php/Mailchimp/Form.php
index 42e29a5e..458f7df6 100644
--- a/src/php/Mailchimp/Form.php
+++ b/src/php/Mailchimp/Form.php
@@ -11,6 +11,8 @@
 namespace HCaptcha\Mailchimp;
 
 use HCaptcha\Helpers\HCaptcha;
+use MC4WP_Form;
+use MC4WP_Form_Element;
 
 /**
  * Class Form.
@@ -74,6 +76,7 @@ public function add_hcap_error_messages( array $messages, MC4WP_Form $form ): ar
 	 *
 	 * @return string
 	 * @noinspection PhpUnusedParameterInspection
+	 * @noinspection PhpUndefinedFieldInspection
 	 */
 	public function add_captcha( string $content, MC4WP_Form $form, MC4WP_Form_Element $element ): string {
 		$args = [
diff --git a/src/php/NF/Fields.php b/src/php/NF/Fields.php
index d465b749..fcb10ea6 100644
--- a/src/php/NF/Fields.php
+++ b/src/php/NF/Fields.php
@@ -67,9 +67,8 @@ public function __construct() {
 	 * @param mixed $data  Data.
 	 *
 	 * @return null|string
-	 * @noinspection PhpUnusedParameterInspection
 	 */
-	public function validate( array $field, $data ) {
+	public function validate( $field, $data ) {
 		$value = $field['value'] ?? '';
 
 		return hcaptcha_request_verify( $value );