SSL certificates are a type of digital certificate that provides authentication for a website, and enables encrypted connections. Shippit is protected by a HTTPS layer. This ensures the data is encrypted content, which is why an up-to-date SSL certificate is required.
The SSL Certificates are managed by Amazon (a trusted Certificate Authority), and auto renew 60 days before a certificate's expiry date.
Due to this renewal mechanism, certificate pinning is not recommended. Because the SSL certificate is renewed 60 days before expiry, a pinned certificate will stop working at this point. Pinning a certificate can therefore create downtime until a new certificate is pinned. For this reason, we do not advise practicing certificate pinning.