To begin using EasyCaptcha, you must first obtain an API key pair for your website. This key pair includes a site key and a secret key. The site key is public and is used to initialize the captcha on your website/application, whereas the secret key must be kept private and is used to verify the captcha responses.
Go to the EasyCaptcha User Dashboard and add your website's name. After that, you should add your website's domain(s). This may include your production, staging as well as development server domains. You don't need to add localhost or 127.0.0.1 as those are included by default.