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what captcha plugin is enabled?
recaptcha should work

however recaptcha_invisible has a bug in plugin implementation, the plugin ignores $code at all

It's Recaptcha. Since #26882 it makes use of $code argument. It seems correct to me as well, but causes issues when passing whatever to checkAnswer() like in this case.

If we keep it as, @akbet1, you'll have to solve it on your end by removing erroneous argument or by passing the actual answer, e.g.

$answer = $captcha->checkAnswer();

Hi

@Fedik
If I check joomla-cms/plugins/captcha/recaptcha_invisible/recaptcha_invisible.php
in joomla 3.9.15
I see there code exactly as you propose use
But we use "recaptcha", we not use "recaptcha_invisible"

@SharkyKZ
we use
$captcha = JCaptcha::getInstance('recaptcha', array('namespace' => 'captcha_keystring_rent_request'));
$answer = $captcha->checkAnswer('captcha_keystring_rent_request');

"captcha_keystring_rent_request" - it need because we have 2 forms on page, so we need check which captcha user press.

If I try use:
$answer = $captcha->checkAnswer();

I see next error:
Too few arguments to function Joomla\CMS\Captcha\Captcha::checkAnswer(), 0 passed in /home/windsorh/public_html/components/com_realestatemanager/realestatemanager.php on line 945 and exactly 1 expected
File: /home/windsorh/public_html/libraries/src/Captcha/Captcha.php
Line: 177

Regards

okay, then what exactly is 'captcha_keystring_rent_request', and how you get it?

As I believe (before), it is namespace, we use it at time show captcha:

$captcha = JCaptcha::getInstance('recaptcha', array('namespace' => 'captcha_keystring_rent_request' ));
echo $captcha->display('recaptcha', 'recaptcha', 'required');

so on 1 page we may have 2 captha, as example for show second captcha we use:

$captcha = JCaptcha::getInstance('recaptcha', array('namespace' => 'captcha_keystring_review' ));
echo $captcha->display('recaptcha', 'recaptcha', 'required');

'captcha_keystring_review' - another namespace

Regards

It's supposed to be the answer.

'captcha_keystring_review' - another namespace

that incorrect,
$captcha->checkAnswer($code); the $code supposed to be a token, answer from recpatcha api on client side

@SharkyKZ was faster ?

Thank you!
but will be best if you provide "how to", and not only hints, some like:
show captcha:

$captcha = JCaptcha::getInstance('recaptcha', array('namespace' => 'captcha_keystring_rent_request' ));
echo $captcha->display('recaptcha', 'recaptcha', 'required');

check captcha:

    //Check enabled plugin captcha-recaptcha
    $recaptchaPluginEnabled = JPluginHelper::isEnabled('captcha', 'recaptcha');

    //Check enable option captcha-recaptcha in admin form
    $app = JFactory::getConfig();
    $recaptchaAdminEnabled = false;
    if($app->get('captcha') == 'recaptcha'){
      $recaptchaAdminEnabled = true;
    }

            if( $googleRecaptchaEnabled && $recaptchaPluginEnabled ){
                $captcha = JCaptcha::getInstance('recaptcha', array('namespace' => 'captcha_keystring_buy_request'));

                if($captcha){
                    $get_answer = JFactory::getApplication()->input->get("g-recaptcha-response", "");
                    $answer = $captcha->checkAnswer($get_answer);
                       //check captcha
                        if(!$answer ) {
                        //captcha check error
                        exit();
                    }
                }
            }

Regards

if( $googleRecaptchaEnabled && $recaptchaPluginEnabled ){

need replace to
if( $recaptchaPluginEnabled && $recaptchaAdminEnabled ){

but !!!!!!
How this worked in joomla 3.9.14 and before ?!!!
without:
$get_answer = JFactory::getApplication()->input->get("g-recaptcha-response", "");

Regards

@akbet1 @SharkyKZ has already provided the answer above #28191 (comment):

It's Recaptcha. Since #26882 it makes use of $code argument. It seems correct to me as well, but causes issues when passing whatever to checkAnswer() like in this case.

PR #26882 was merged end of December last year, this explains that there is a difference between 3.9.14 and 3.9.15.

Hi
But continue this not good, as me seem, you may give possibility run
$answer = $captcha->checkAnswer(); <-- without argumenets

and in plugin, if call with "$code = null", you need add code like below:

public function onCheckAnswer($code = null)
{
$input = \JFactory::getApplication()->input;
$privatekey = $this->params->get('private_key');
if( $code == null) $code = $input->get("g-recaptcha-response", "");

Regards

But, Thank you for your support !!!

There is already code like that in Recaptcha plugin:

If code is not provided, g-recaptcha-response input variable is used.

Sorry,
Bur As I wrote:

If I try use:
$answer = $captcha->checkAnswer();

I see next error:
Too few arguments to function Joomla\CMS\Captcha\Captcha::checkAnswer(), 0 passed in /home/windsorh/public_html/components/com_realestatemanager/realestatemanager.php on line 945 and exactly 1 expected
File: /home/windsorh/public_html/libraries/src/Captcha/Captcha.php
Line: 177

Regards

You're right. It can't be omitted. So it should be either the answer or null.

More than 2 years later, I guess the author solved this issue base on the suggested code provided by @SharkyKZ in earlier comment. So I'm closing this issue. If you still need help (I don't think so), feel free to re-open.