To protect your web forms from spam and abuse we recommend to use reCAPTCHA - a free service from Google. reCAPTCHA uses an advanced risk analysis engine and adaptive CAPTCHAs to keep automated software from engaging in abusive activities on your site. It does this while letting your valid users pass through with ease.
For adding reCAPTCHA to your site, you need to register your site and get reCAPTCHA API keys.
Register your site at Google from here – https://www.google.com/recaptcha/admin
The key pair consists of a site key and secret key. The site key is used to invoke reCAPTCHA service on your site. The secret key authorizes communication between your application backend and the reCAPTCHA server to verify the user's response. The secret key needs to be kept safe for security purposes.
For instructions on client and server side integrations goto https://developers.google.com/recaptcha/intro
Open a support ticket if you need any help.
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