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diff --git a/includes/recaptcha/ReCaptcha/RequestMethod/Post.php b/includes/recaptcha/ReCaptcha/RequestMethod/Post.php
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+++ b/includes/recaptcha/ReCaptcha/RequestMethod/Post.php
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+<?php
+/**
+ * This is a PHP library that handles calling reCAPTCHA.
+ *
+ * BSD 3-Clause License
+ * @copyright (c) 2019, Google Inc.
+ * @link https://www.google.com/recaptcha
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace ReCaptcha\RequestMethod;
+
+use ReCaptcha\ReCaptcha;
+use ReCaptcha\RequestMethod;
+use ReCaptcha\RequestParameters;
+
+/**
+ * Sends POST requests to the reCAPTCHA service.
+ */
+class Post implements RequestMethod
+{
+    /**
+     * URL for reCAPTCHA siteverify API
+     * @var string
+     */
+    private $siteVerifyUrl;
+
+    /**
+     * Only needed if you want to override the defaults
+     *
+     * @param string $siteVerifyUrl URL for reCAPTCHA siteverify API
+     */
+    public function __construct($siteVerifyUrl = null)
+    {
+        $this->siteVerifyUrl = (is_null($siteVerifyUrl)) ? ReCaptcha::SITE_VERIFY_URL : $siteVerifyUrl;
+    }
+
+    /**
+     * Submit the POST request with the specified parameters.
+     *
+     * @param RequestParameters $params Request parameters
+     * @return string Body of the reCAPTCHA response
+     */
+    public function submit(RequestParameters $params)
+    {
+        $options = array(
+            'http' => array(
+                'header' => "Content-type: application/x-www-form-urlencoded\r\n",
+                'method' => 'POST',
+                'content' => $params->toQueryString(),
+                // Force the peer to validate (not needed in 5.6.0+, but still works)
+                'verify_peer' => true,
+            ),
+        );
+        $context = stream_context_create($options);
+        $response = file_get_contents($this->siteVerifyUrl, false, $context);
+
+        if ($response !== false) {
+            return $response;
+        }
+
+        return '{"success": false, "error-codes": ["'.ReCaptcha::E_CONNECTION_FAILED.'"]}';
+    }
+}