You can obtain the new secret by calling API endpoint using your current not yet expired credentials and the code that was sent with the notification email. For details on API endpoint, please see Client Credentials section.
Both the current secret value and the new secret value will be recognized during the transition period. After the current secret expires, you must use the new secret.
If you were unable to renew the secret via API endpoint, you can still contact Service and they will email you new secret via secure email.