               return  if failed err, callback, credential, credData
               callback null, credential
 
+
+  @one$: permit 'list credentials',
+
+    success: (client, publicKey, callback)->
+
+      options  = { limit : 1 }
+      selector = { publicKey }
+
+      {delegate} = client.connection
+      delegate.fetchCredentials {},
+        targetOptions : {
+          selector, options
+        }, (err, res = [])->
+          callback err, res[0]
+
+
+  @some$: permit 'list credentials',
+
+    success: (client, selector, options, callback)->
+
+      [options, callback] = [callback, options]  unless callback
+      options ?= { limit : 10 }
+
+      {delegate} = client.connection
+      delegate.fetchCredentials {},
+        targetOptions : {
+          selector, options
+        }, callback
+
+
   delete: permit
 
     advanced: [

    callback err
    return true

  @create = permit 'create credential',

    success: (client, data, callback)->


    success: (client, callback)->

      @fetchData (err, credentialData) =>
        return callback err  if err
        credentialData.remove (err) =>
          return callback err  if err
          @remove callback
