creds contains user certificate, private key and config.

user config:

{
    "name":"PeerAdmin",
    "mspid":"Org1MSP",
    "roles":null,
    "affiliation":"",
    "enrollmentSecret":"",
    "enrollment":{
        "signingIdentity":"<>",
        "identity":{
            "certificate":"-----BEGIN CERTIFICATE-----\n\n-----END CERTIFICATE-----\n"
        }
    }
}