Thank you very much Kelvyn for your speedy reply. I did go and get the new keys as suggested. Do I just copy and paste them in the Plugin section after selecting version 2?
Google also mentions the following about client side and server side intregration - is this something I need to do as well? If so, where do I find these files I need to edit?
Step 1: Client side integration
Paste this snippet before the closing </head> tag on your HTML template:
<script src='
https://www.google.com/recaptcha/api.js'></script>
Paste this snippet at the end of the <form> where you want the reCAPTCHA widget to appear:
<div class="g-recaptcha" data-sitekey="6Lcfrk8UAAAAAIEcu3WLIf9_J38XeywcOj5f-j6A"></div>
The reCAPTCHA documentation site describes more details and advanced configurations.
Step 2: Server side integration
When your users submit the form where you integrated reCAPTCHA, you'll get as part of the payload a string with the name "g-recaptcha-response". In order to check whether Google has verified that user, send a POST request with these parameters:
URL:
https://www.google.com/recaptcha/api/siteverifysecret (required) 6Lcfrk8UAAAAAOpvCKM0UrlkHkAAkWC4URVsb-XF
response (required) The value of 'g-recaptcha-response'.
remoteip The end user's ip address.