Snippets Support > Snippets > Captcha
This little snippet shows how to create a random number and use it for simple "captcha" like purposes, and fight off spambots.
All you need to do to use this as a captcha is set up the proper conditionals. In this case I'm going to disable the passdata feature and simply change the message you get, if the captcha is not entered properly. You could just as easily do the same thing with savedata, emailto, create or any other ZAP action.
The random number and captcha values are produced by a markup in ZAPmarkup.