curl \
  -k \
  -s \
  -H "Accept: application/json" \
  --user caadmin:Secret.123 \
  https://localhost.localdomain:8443/ca/rest/admin/users/caadmin/certs | python -m json.tool
{
    "total": 1,
    "Cert": [
        {
            "Version": 2,
            "SerialNumber": "0x6",
            "IssuerDN": "CN=CA Signing Certificate,OU=pki-tomcat,O=EXAMPLE",
            "SubjectDN": "CN=PKI Administrator,[email protected],OU=pki-tomcat,O=EXAMPLE",
            "PrettyPrint": null,
            "Encoded": null,
            "Link": {
                "rel": "self",
                "href": "https://localhost.localdomain:8443/ca/rest/admin/users/caadmin/certs/2%253B6%253BCN%253DCA+Signing+Certificate%252COU%253Dpki-tomcat%252CO%253DEXAMPLE%253BCN%253DPKI+Administrator%252CE%253Dcaadmin%2540example.com%252COU%253Dpki-tomcat%252CO%253DEXAMPLE",
                "type": "application/json"
            },
            "id": "2;6;CN=CA Signing Certificate,OU=pki-tomcat,O=EXAMPLE;CN=PKI Administrator,[email protected],OU=pki-tomcat,O=EXAMPLE"
        }
    ],
    "Link": []
}