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How do I implement reCaptcha in ASP.NET MVC and C#?
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If your site was built by a 3rd party developer, you will no longer be able to use reCAPTCHA without an active Google account. Your developer most likely setup the API using their own Google credentials, as there was no need to activate it with a credit card.
Many websites are still using reCAPTCHA v2, which was launched in 2014. If a user's behavior triggers suspicion, reCAPTCHA v2 will provide a challenge that the visitor must solve to prove they're human. We're all familiar with the various versions of reCAPTCHA v2.
There are a few great examples:
This has also been covered before in this Stack Overflow question.
NuGet Google reCAPTCHA V2 for MVC 4 and 5
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