{
    "credentials":[{
            "passwordCredentials":{
                "username":"test_user",
                "password":"mypass"
            }
        },
        {
            "OS-KSEC2-ec2Credentials":{
                "username":"test_user",
                "secret":"aaaaa",
                "signature":"bbb"
            }
        }
    ],
    "credentials_links":[]
}
