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How to setup reCaptcha to appear on the registration form?

I followed above link & able to setup reCaptcha for Login form. It works fine.

Now for login I'm creating my custom Multi-Step form. 4-5 steps.

How we can define where to show this captcha or which code needs to be use so we can show it whenever it requires?

1

The following will add the captcha,

public function buildForm(array $form, FormStateInterface $form_state) {
...
  $form['captcha'] = array (
    '#type' => 'captcha',
    '#captcha_type' => 'recaptcha/reCAPTCHA'
  );
  return $form;
}
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