Invisible reCAPTCHA | Google for DevelopersInvisible reCAPTCHA Stay organized with collections Save and categorize content based on your preferences. This page explains how to enable and customize the invisible reCAPTCHA on your webpage. To invoke the invisible reCAPTCHA, you can either: Automatically bind the challenge to a button or Programmatically bind the challenge to a button or Programmatically invoke the challenge See Configuration
Googleのスパム防止認証システムInvisible reCAPTCHAの設置方法 - ブロギングライフ
