-               // Certificate object
-               array(
-                       // Public cert
-                       //XXX: required
-                       'cert' => '/etc/pki/tls/certs/httpd.pem',
-                       // Private key
-                       //XXX: required
-                       'key' => '/etc/pki/tls/private/httpd.pem',
-                       // Mail address
-                       //XXX: required
-                       'mail' => 'example@example.com',
-                       // Domain list
-                       //XXX: required
-                       'domains' => array(
-                               'www.example.com',
-                               'example.com'
+               //Thumbprint file
+               'thumbprint' => '/etc/acmepl/thumbprint',
+               //Certificate array
+               'certificates' => array(
+                       // Certificate object
+                       array(
+                               // Public cert
+                               //XXX: required
+                               'cert' => '/etc/pki/tls/certs/httpd.pem',
+                               // Private key
+                               //XXX: required
+                               'key' => '/etc/pki/tls/private/httpd.pem',
+                               // Mail address
+                               //XXX: required
+                               'mail' => 'webmaster@example.com',
+                               // Root domain
+                               //XXX: required
+                               'domain' => 'www.example.com',
+                               // Domain list
+                               //XXX: required
+                               'domains' => array(
+                                       'example.com',
+                                       #...
+                               ),
+                               // Production certificate
+                               //XXX: optional
+                               //XXX: set to 1 for production
+                               'prod' => 0