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Google reCAPTCHA Indirect API v3.0 - Source Code

reCAPTCHA is a freely available CAPTCHA implementation. It distinguishes humans from computers. reCAPTCHA is a CAPTCHA program, used to distinguish humans from computers, that uses the answers provided by the user to help digitize scans of old books and newspapers. This API is indirect access to this service, please refer to the SDK below.
Google reCAPTCHA