SAML response verification for authentication to Edge

Hi,

We are planning to integrate our SAML IdP for logging on to Apigee Edge as per the process documented at https://docs.apigee.com/api-services/content/enabling-saml-authentication-edge

The page does not mention that IdP certificate is required by Apigee. So, how does Apigee verify that it is a valid SAML response.

Thanks,

Jaskaran

Bump it please.