Integration with Google ReCaptcha [closed]

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I added Google ReCaptcha but it does not seem to work.

I use one index.html in which i have my form and a file.php to send the form.

In my console, i am at the "integration" in the "Verify the reCAPTCHA token" section and I am stuck here. I want to use the php method but I don't understand 2 things:

What does "require 'vendor/autoload.php';" mean in the beginning of the code?
Where do I paste this code?

I did paste the code from "Add reCAPTCHA to your website" section in my html file but it is the integration where I am stuck.

This is my form in my index.php:

  <form action="submit-form.php" method="POST" class="space-y-4" name="gtld">
    <input type="text" name="company" placeholder="Company Name" required class="w-full p-3 border border-gray-300 rounded" />
    <input type="text" name="contact" placeholder="Contact Person" required class="w-full p-3 border border-gray-300 rounded" />
    <input type="url" name="website" placeholder="Website" required class="w-full p-3 border border-gray-300 rounded" />

    <fieldset class="border p-4 rounded">
      <legend class="text-lg font-medium">Services Offered</legend>
      <div class="space-y-2 mt-2">
        <label class="block"><input type="checkbox" name="services[]" value="Application writing and submission" /> Application writing and submission</label>
        <label class="block"><input type="checkbox" name="services[]" value="Provide advice and identify resources" /> Provide advice and identify resources</label>
        <label class="block"><input type="checkbox" name="services[]" value="Legal services" /> Legal services</label>
        <label class="block"><input type="checkbox" name="services[]" value="Backend Registry provider" /> Backend Registry provider</label>
      </div>
    </fieldset>

    <textarea name="about" maxlength="300" placeholder="About the Company (max 300 characters)" class="w-full p-3 border border-gray-300 rounded" required></textarea>

    <button class="g-recaptcha"
        data-sitekey="8LcIiKwrAAAAAPyi7EBe1oNCmVORx_SYxdLVpAtk"
        data-callback='onSubmit'
        data-action='submit'>
        Submit
    </button>
  </form>

I added the first necessary Google captcha scripts for the html button

I added the second script and changed the "demo-form" to the name of my form so it matches:

<script>
  function onSubmit(token) {
    document.getElementById("demo-form").submit();
  }
</script>

I also added the third script to my index.html as given by Google in its interface for my project/:

<button class="g-recaptcha"
    data-sitekey="6LcIiKwrAAAAAPyi7EBe1oNCmVORx_SYxdLVpAtk"
    data-callback='onSubmit'
    data-action='submit'>
  Submit
</button>

THEN, the next step is to "Verify the reCAPTCHA token" with the various methods given by Google captcha.

I tried the REST API creating a "request.json" file and added the code suggested inside:

{
  "event": {
    "token": "TOKEN",
    "expectedAction": "USER_ACTION",
    "siteKey": "8LcIiKwrAAAAAPyi7EBe1oNCmVORx_SYxdLVpAtk",
  }
}

When all this is online, I proceeded with the next step "Send an HTTP POST request with the saved JSON data to the url below."

The URL below is : https://recaptchaenterprise.googleapis.com/v1/projects/annuaire-1755692338178/assessments?key=API_KEY (I changed the API_KEY to the one I created) butwhen enter the URL in my browser, I get a "his recaptchaenterprise.googleapis.com page can’t be found" : is in the browser that I should enter this URL ?

If yes...then what do I do wrong?

You seem to be confused between standard ReCaptcha and Enterprise Recaptcha. Make sure you use the right version of the documentation - see developers.google.com/recaptcha — ADyson
– ADyson, Commented Aug 24, 2025 at 23:22

Cactusss · Accepted Answer · 2025-08-24 18:44:29Z

Thats the enterprise URL. It needs Google Cloud setup if Im not mistaken. You probably want to use the normal recaptcha v2/3. You cant open the URL in browser as it need a POST and more setup. The require is for googles library, but you don't need that. Just integrate with something like this:

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $recaptchaSecret = "YOUR_SECRET_KEY"; // Secret NOT the site key
    $recaptchaResponse = $_POST['g-recaptcha-response'];

    // Verify token with Google
    $url = 'https://www.google.com/recaptcha/api/siteverify';
    $data = [
        'secret' => $recaptchaSecret,
        'response' => $recaptchaResponse,
        'remoteip' => $_SERVER['REMOTE_ADDR']
    ];

    $options = [
        'http' => [
            'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
            'method'  => 'POST',
            'content' => http_build_query($data)
        ]
    ];

    $context  = stream_context_create($options);
    $result = file_get_contents($url, false, $context);
    $verification = json_decode($result);

    if ($verification->success) {
        // success captcha passed
        echo "Form submitted successfully!";
    } else {
        // captcha failed
        echo "reCAPTCHA verification failed.";
    }
}

Will try this but I am concerned with the Enterprise URL which kind of "forces me " to create a project, etc... anyway. Thanks.
Don't understand why you're forced to use the enterprice URL...

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