CaptchaStringResolver.php

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<?php
namespace Magento\Captcha\Observer;

class CaptchaStringResolver
{
    public function resolve(\Magento\Framework\App\RequestInterface $request, $formId)
    {
        $captchaParams = $request->getPost(\Magento\Captcha\Helper\Data::INPUT_NAME_FIELD_VALUE);

        return $captchaParams[$formId] ?? '';
    }
}