A problem occurred somewhere in the SSL/TLS handshake

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Curl doesn’t have built-in root certificates (like most modern browser do). You need to explicitly point it to a cacert.pem file: 

  curl_setopt($ch, CURLOPT_CAINFO, '/path/to/cert/file/cacert.pem');

Without this, curl cannot verify the certificate sent back via ssl. This same root certificate file can be used every time you use SSL in curl.

You can get the cacert.pem file here: http://curl.haxx.se/docs/caextract.html

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