Signing certificates are used to encrypt access tokens. There are two, the primary certificate to use and a secondary certificate that serves as a fallback for the primary certificate.
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On the left panel, click Settings , and then click the GENERAL tab.
The General tab shows whether a primary and secondary certificate is In Use or Not in Use .
To change the certificates, you must run the Smart API Manager Configuration tool again. For instructions, please see the Smart API Manager Installation and Configuration Guide.