There is one certificate that covers *.nexmo.com when using our API. This is signed by a major Certificate Authority. If you do not trust the major Certificate Authority by default, this must be imported (note that this is very unusual).
The certificate can be downloaded from:
Please note we can switch host IP addresses at any time and without notice to insure high availability and transparent failover if needed.
If you face any certificate related rejection, please follow these steps:
1. Retrieve the new certificate from https://static.nexmo.com/tls/2017-06/wildcard.nexmo.com.pem (this certificate is relevant for *.nexmo.com).
2. Export it in the format you prefer.
3. Import it into your application.
If you need to update the root certificate authority, this is available on https://www.digicert.com/CACerts/DigiCertGlobalRootG2.crt