Error cURL error 60

This is the web host’s responsibility to resolve, as the error relates to the system sending the cURL request – i.e. your server – (and not the server receiving the request).

See https://stackoverflow.com/questions/24611640/curl-60-ssl-certificate-unable-to-get-local-issuer-certificate for steps they can take to resolve.

For IIS users, see https://www.bluevalleytech.com/techtalk/blog/error-60-ssl-certificate-problem-unable-to-get-local-issuer-certificate-when-running-php-under-windows-iis.aspx