reCAPTCHA settings for test sites.

I wasn't able to find this documented here anywhere (although i am sure it must be) - but for D7 I did find it on Drupal Answers.. and sorted out for D8.

If you want to override the recaptcha failing due to your test site not being the domain configured on Google for the API key; then try overriding your keys with these in your settings.php:

D7:
$conf['recaptcha_secret_key'] = '6LeIxAcTAAAAAGG-vFI1TnRWxMZNFuojJ4WifJWe';
$conf['recaptcha_site_key'] = '6LeIxAcTAAAAAJcZVRqyHh71UMIEGNQ_MXjiZKhI';

D8:
$config['recaptcha.settings']['secret_key'] = '6LeIxAcTAAAAAGG-vFI1TnRWxMZNFuojJ4WifJWe';
$config['recaptcha.settings']['site_key'] = '6LeIxAcTAAAAAJcZVRqyHh71UMIEGNQ_MXjiZKhI';