Finally got this to work!
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Download the certificate bundle.
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Put it somewhere. In my case, that was
c:\wamp\directory (if you are using Wamp 64 bit then it’sc:\wamp64\). -
Enable
mod_sslin Apache andphp_openssl.dllinphp.ini(uncomment them by removing;at the beginning). But be careful, my problem was that I had twophp.inifiles and I need to do this in both of them. One is the one you get from your WAMP taskbar icon, and another one is, in my case, inC:\wamp\bin\php\php5.5.12\ -
Add these lines to your cert in both
php.inifiles:curl.cainfo="C:/wamp/cacert.pem" openssl.cafile="C:/wamp/cacert.pem" -
Restart Wamp services.