Anti-fraud Integration via Verification Page
See the example of the verification page :
Verification Page
1
Put verification page's file "kb.html" in your website's root directory
Download and unzip kb.html.zip, and put it in your website's root directory
2
To check the website traffic, put this JS code in your website's footer
<script type="text/javascript">
VerificationPageKey = "12345678";
if (document.cookie.indexOf("cKillBot") == -1) {
    document.cookie = "cKillBot=1; path=/";
    setTimeout( function() {window.location.href = "/kb.html?hash_str="+VerificationPageKey+"&r="+Math.random()}, 1500);
}
</script>
3
Contact us to get your own verification key
Or use public API key: VerificationPageKey = "12345678";
<script type="text/javascript">
VerificationPageKey = "12345678"
</script>
4
Yandex Metrica integration
  1. Create a Yandex.Metrica account here: https://metrika.yandex.com/
  2. Add a Yandex.Metrica tag in the top part of the file "kb.html"
5
See the results of the fraud check
In Yandex.Metrica reports (Session Parameters => fraud).
https://metrika.yandex.com/stat/visor
WebVisor report Example: