However, if you do not see any captcha image, please check your PHP settings (/scripts/phpinfo.php) and GD support must be enabled.
Sometimes, FreeType library is required.
Please, read more here: https://php.net/manual/en/function.imagettftext.php
Sometimes, FreeType library is required.
Please, read more here: https://php.net/manual/en/function.imagettftext.php
Or you can also switch to google captcha in Merchant panel > Configuration > Captcha