Google NoCaptcha
From KOP KB
Header Code
At the top of the page you will want this code in the header tag somewhere.
<script src='https://www.google.com/recaptcha/api.js'></script>
The Div
The div below you will try to put as near to the submit button as you want.
<div class="g-recaptcha" data-sitekey="yourpublickey" data-theme="dark" ></div>