Block hCaptcha in admin for CF7 Stripe.

src/php/CF7/Admin.php

@@ -108,13 +108,23 @@ private function insert_live_form( string $output ): string {
 		}
 
 		$form_shortcode = htmlspecialchars_decode( $m[1] );
+		$live_form      = do_shortcode( $form_shortcode );
+		$stripe_message = '';
+
+		if ( $this->has_stripe_element( $live_form ) ) {
+			$stripe_message =
+				'<h4><em>' .
+				__( 'The Stripe payment element already contains an invisible hCaptcha. No need to add it to the form.', 'hcaptcha-for-forms-and-more' ) .
+				'</em></h4>';
+		}
 
 		$live_container =
 			"\n" .
 			'<div id="postbox-container-live" class="postbox-container">' .
 			'<div id="form-live">' .
-			'<h3>Live Form</h3>' .
-			do_shortcode( $form_shortcode ) .
+			'<h3>' . __( 'Live Form', 'hcaptcha-for-forms-and-more' ) . '</h3>' .
+			$stripe_message .
+			$live_form .
 			'</div>' .
 			'</div>' .
 			"\n";

src/php/CF7/Base.php

@@ -42,4 +42,15 @@ public function init_hooks(): void {
 		$this->mode_auto  = hcaptcha()->settings()->is( 'cf7_status', 'form' );
 		$this->mode_embed = hcaptcha()->settings()->is( 'cf7_status', 'embed' );
 	}
+
+	/**
+	 * Whether the form contains a Stripe element.
+	 *
+	 * @param string $output Output.
+	 *
+	 * @return bool
+	 */
+	protected function has_stripe_element( string $output ): bool {
+		return false !== strpos( $output, '<div class="wpcf7-stripe">' );
+	}
 }

src/php/CF7/CF7.php

@@ -58,23 +58,24 @@ public function init_hooks(): void {
 	 * @param array|string $attr   Shortcode attributes array or empty string.
 	 * @param array        $m      Regular expression match array.
 	 *
-	 * @return string|mixed
+	 * @return string
 	 * @noinspection PhpUnusedParameterInspection
 	 */
-	public function wpcf7_shortcode( $output, string $tag, $attr, array $m ) {
+	public function wpcf7_shortcode( $output, string $tag, $attr, array $m ): string {
+		$output = (string) $output;
+
 		if ( 'contact-form-7' !== $tag ) {
 			return $output;
 		}
 
-		if ( false !== strpos( $output, '<div class="wpcf7-stripe">' ) ) {
+		if ( $this->has_stripe_element( $output ) ) {
 			/**
 			 * Do not show hCaptcha in the CF7 form having Stripe field.
 			 * Stripe payment form has its own hidden hCaptcha field.
 			 */
-			return $output;
+			return preg_replace( '/\[cf7-hcaptcha.*?]/', '', $output );
 		}
 
-		$output             = (string) $output;
 		$form_id            = isset( $attr['id'] ) ? (int) $attr['id'] : 0;
 		$cf7_hcap_shortcode = $this->get_cf7_hcap_shortcode( $output );