cURL error 60: SSL certificate: unable to get local issuer certificate
All of the answers are correct ; but the most important thing is You have to find the right php.ini file. check this command in cmd " php --ini " is not the right answer for finding the right php.ini file.
if you edit
curl.cainfo ="PATH/cacert.pem"
and check
var_dump(openssl_get_cert_locations());
then curl.cainfo should have a value. if not then that's not right php.ini file;
*I recommend you to search *.ini in wamp/bin or xxamp/bin or any server you use and change them one by one and check it. *