How to connect reCAPTCHA correctly?

Question

HTML

Registered captcha. How to implement the correct integration on the client and server side?
Simply inserted into the form div. Will it work this way submit? How to link submitand captcha?

<div class="g-recaptcha" data-sitekey=""></div> <button type="submit" class="btn btn-xl" value="submit">ОТПРАВИТЬ</button>

Here we are talking about a POST request:

Through what to send it?

Answer 1

recaptcha accepts get requests

$url = 'https://www.google.com/recaptcha/api/siteverify?secret=YOU_SECRET_KEY&response='.(array_key_exists('g-recaptcha-response', $_POST) ? $_POST["g-recaptcha-response"] : '').'&remoteip='.$_SERVER['REMOTE_ADDR'];
$resp = json_decode(file_get_contents($url), true);
                    
if ($resp['success'] == true) {
//все хорошо 
}
else {
// капча не решена
}

you need the captcha to be in the form itself, where you have all the inputs