How to Identify and Handle reCAPTCHA v2, v3, and Enterprise Variants

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Google reCAPTCHA comes in four distinct variants — v2 checkbox, v2 invisible, v3 score, and Enterprise — each behaving and failing in different ways. Developers can identify which version a site uses by inspecting page source and script tags: api.js with a visible checkbox signals v2, a render parameter in the URL indicates v3, and enterprise.js confirms the Enterprise variant. v2 versions present puzzle-based challenges, while v3 assigns a reputation score between 0.0 and 1.0 based on IP, fingerprint, and behavior, with no visible widget at all. Enterprise mirrors v2 or v3 mechanics but runs under a different JavaScript namespace and may carry additional backend signals. A common automation pitfall is submitting a token meant for one variant to another endpoint, causing silent rejections — making correct identification the critical first step.

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