PayPal IPN acknowledgements failing with SSL routines:SSL3_READ_BYTES:sslv3 alert handshake failure

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This is the same problem as Error 0x1408F10B: “SSL3_GET_RECORD:wrong version number” with PayPal SDK

The version of PayPal API we are using hard codes CURLOPT_SSLVERSION to 3.

Our fix is to insert this before any PayPal calls.

PPHttpConfig::$DEFAULT_CURL_OPTS[CURLOPT_SSLVERSION] = 4;

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