reCAPTCHA for Salon Booking System is a plugin that brings recaptcha functionality to Salon Booking System.
Before using this plugin, make sure you have Salon Booking System version 3 (or newer) installed. You can download
Salon Booking System from the plugin repository Salon Booking System
Once installed you can download and install this plugin.
The Source
No surprises. You can lookup the source any time on Github.