In previous tutorials, we took a deep dive into WordPress HTTP API, learned how to use the HTTP API in consuming APIs in plugins during the course of building a widget that displays WHOIS and social data of a domain and integrating a CAPTCHA with the WordPress login form.
In this tutorial, we will code a plugin that will this time around, integrate CAPTCHA (Google's reCAPTCHA) to the default WordPress registration form. Of course, the HTTP API will be used to communicate with reCAPTCHA endpoint to verify the answer supplied by a user to the CAPTCHA challenge.
Below is a screenshot of the registration form protected by CAPTCHA to prevent spam registration.
Image may be NSFW.
Clik here to view.
Why Include a CAPTCHA with the Registration Form?
Due to the increasing popularity of WordPress, it has become an easy target for unscrupulous automated software. This software crawls the web in search of websites built with WordPress and starts registering hundreds and thousands of accounts every minute.
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