On June 20th, Nexmo will replace the public TLS certificate on *.nexmo.com. This change will have no impact for most customers, since our new certificate will be signed by the major certificate authorities.
If you store your certificates locally, your platform might be still set up to use the old certificate, which will get revoked on June 21st. Before then, you will need to:
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 also use intermediate certificates, this can be found at https://static.nexmo.com/tls/2017-06/wildcard.nexmo.com-intermediate.pem
If you need further assistance, please do not hesitate to contact us at email@example.com