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Some changes I made (after noticing a few issues with it):

• ExtraClasses has no need to be a field and a property; replaced both with public List<string> ExtraClasses { get; } = new List<string>();.
• Since GetBodyDivContent is not static, I made removed extraClasses from the parameter, and made it directly used in the method.
• I extracted a lot of Validate out to other protected methods.
• I replaced ParseJson with TryParseJson as per RobH's answer.

Version as of this answer: ReCaptchaValidator.cs