The reCaptcha PHP 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. Users can access the API at https://2captcha.com/api-2captcha
Since Microsoft launched its Bot Framework earlier this year, it has consistently added features to empower developers to create, what Microsoft calls, "the next great conversational experiences." The latest API additions include the Computer Vision, Bing Speech, and Bing Image Search APIs.