[joeroberts]

try this
make sure you edit the Privatekey and it needs to be for v-2

<?php 

class TSUE_captcha
{
    private $apiURL = "https://www.google.com/recaptcha/api/siteverify?secret=";
    private $privatekey = "6LfHFTQUAAAARFGHTDGGOyBEj7S";
    public $status = false;
    public $error = "";

    public function verifyCaptcha($recaptcha_challenge_field = "", $recaptcha_response_field = "")
    {
                $ip = $_SERVER['REMOTE_ADDR'];
                $response=file_get_contents($this->apiURL.$this->privatekey."&response=".$recaptcha_response_field."&remoteip=".$ip);
                $responseKeys = json_decode($response,true);         
                $this->status = intval($responseKeys["success"]) !== 1 ? false : true;
                if(!$this->status)
                {
                    $this->error = $responseKeys['error-codes'][0];
                }

        return $this->status;
    }

}