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PayPal Certificate Upgrade

PayPal is upgrading the certificate for to SHA-256. This endpoint is also used by merchants using the Instant Payment Notification (IPN) product.

A detailed FAQ has been provided here:

Merchant Security System Upgrade Guide

Also the microsite:

2015-2016 SSL Certificate Change

For most online store owners the primary concern is that your server has the correct new G5 certificate installed. Instructions for testing can be found here:

Cert Check For Linux

If you’re running CentOS or RedHat then the command is: