For added security, we can sign all our HTTPS requests to APIs with SSL/TLS client certificates. This is particularly useful for customers hosting on-premise instances of their apps (e.g. JIRA or GitHub Enterprise).
We use client certificates signed by our own Certificate Authority, so you will need to explicitly authorize either our client certificate (client.crt attached below) or our CA certificate (ca.crt attached below). Our certificates use RSA + SHA256 ciphers, with 4096-bit keys.
Contact us to enable SSL client certificates for your server.