The 2Captcha API in REST architecture returns data of human-powered image recognition to authorize online users. Starting with an API Key, developers can apply an available algorithm that includes sending an image to a server, obtaining the ID of the picture, beginning the cycle that checks if the CAPTCHA is solved, and confirming if the answer is correct.
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The reCaptcha C# VB .NET Sample Code by 2Captcha demonstrates how to access captcha features for verification purposes. It is powered by an algorithm that recognizes images as the authentication method.