Google Capcha:
Site Key : 6LdT5BwTAAAAAHP9S-A5QQUIDmMoK5Hd_p5ZWCt8
Secret Key : 6LdT5BwTAAAAAKEVUvViBKApAdpphEnu63uSbW8K

head:
<script src='https://www.google.com/recaptcha/api.js'></script>
Position:
<div class="g-recaptcha" data-sitekey="6LdT5BwTAAAAAHP9S-A5QQUIDmMoK5Hd_p5ZWCt8"></div>