CAPTCHA
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CAPTCHAs are services that protect your website from spam and disruptive behaviour. They generally use risk analysis techniques in the background to tell humans and bots apart. FOSSBilling supports Google reCAPTCHA out of the box. However, you will be able to find replacements like Cloudflare Turnstile and hCaptcha in the extension directory in the future.
CAPTCHAs usually take place in the forms end-users interact. Commonly, they take place in registration, order and contact forms.