IDP Certificate Rollover

How do you import or configure the certificate for a Remote IDP after certificate rollover?
Is it possible to validate the SAML response in AM just by adding the x509 public certificate in the SAML assertion that is sent by the IDP so we don’t to worry about CA rollover?

The IDP can be configured to send the x509 certificate in the SAML Response to AM.

The IDP is a third party software, SP and both the IDP have been configured in AM - but now we need to manage the rollover of the signing certificate from the IDP.

We are using FR AM 7.1.

Thanks In Advance.

Kind regards