Add project files.

ConstructorAppUI/wwwroot/WebTheme/bat/reCaptcha.php

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+<?php
+// Initiate the autoloader.
+require_once 'ReCaptcha/autoload.php';
+
+// Register You API keys at https://www.google.com/recaptcha/admin
+// And write it here
+$siteKey = '6LfZlSETAAAAAC5VW4R4tQP8Am_to4bM3dddxkEt';
+$secret = '6LfZlSETAAAAAOi4lh7GHcSOO0pbXnAMJRhnsr7O';
+
+// reCAPTCHA supported 40+ languages listed here: https://developers.google.com/recaptcha/docs/language
+$lang = 'en';
+
+// If No key
+if ($siteKey === '' || $secret === ''):
+  die('CPT001');
+elseif (isset($_POST['g-recaptcha-response'])):
+
+  // If the form submission includes the "g-captcha-response" field
+  // Create an instance of the service using your secret
+  $recaptcha = new \ReCaptcha\ReCaptcha($secret);
+
+  // Make the call to verify the response and also pass the user's IP address
+  $resp = $recaptcha->verify($_POST['g-recaptcha-response'], $_SERVER['REMOTE_ADDR']);
+
+  if ($resp->isSuccess()):
+    // If the response is a success, that's it!
+    die('CPT000');
+  else:
+    // Something wrong
+    die('CPT002');
+  endif;
+
+endif;
+?>