If I import a p12 with certificates into the App Settings / Certificates view, and provide the passphrase, I see the contained certificates in that window. The question is what is being stored in the code repository? The certs themselves (public and private keys), or the p12? If it's the p12, how is the passphrase supplied during deployment? (Mendix Studio 10.7.0)
In the code repository, typically, you store the .p12 file containing both the public and private keys. The passphrase isn't stored in the repository. During deployment, you provide the passphrase separately, usually through a secure environment variable or a configuration file.