Where can I find SSL certificates for Payflow Pro and Pilot API servers?

The following SSL certificates are currently valid for Payflow Pro servers.
 

Warning: These SSL certificates are for use with legacy implementations ONLY. Do NOT download or install these certificates unless your integration requires an X.509 leaf certificate in your trust store.

PayPal is upgrading the SSL/TLS certificates used to secure our websites and API endpoints. The new certificates will use a trust chain signed by DigiCert root certificates. You may need to ensure that your environment supports connections that rely on the DigiCert root certificates.

Currently deployed certificates: 
  
Endpoint SSL Certificate Certificate Authority Expiration Date
payflowpro.paypal.com payflowpro.paypal.com_SHA-2_05052019.pem Symantec May 5, 2019
pilot-payflowpro.paypal.com pilot-payflowpro.paypal.com_SHA-2_02292019.pem Symantec February 29, 2019

Upcoming certificate deployments:  
 
Endpoint SSL Certificate Certificate Authority Expiration Date Target Live Date
payflowpro.paypal.com TBD DigiCert TBD January 2019
pilot-payflowpro.paypal.com pilot-payflowpro.paypal.com_09272020.pem DigiCert September 27, 2020 October 17, 2018