Thanks for the speedy response. Webstie exists on my own server – IIS. Relevant settings in already set in php.ini:
allow_url_fopen = On
curl.cainfo = "C:\Program Files (x86)\IIS Express\PHP\v7.1\extras\ssl\cacert.pem"
extension=php_curl.dll
Sorry, I don’t understand when you say “check if Curl support”
Be grateful for further advice.