diff --git a/Yavsc/src/Model/Identity/ApplicationUser.cs b/Yavsc/src/Model/Identity/ApplicationUser.cs
index 51f66416..34cfbe6b 100644
--- a/Yavsc/src/Model/Identity/ApplicationUser.cs
+++ b/Yavsc/src/Model/Identity/ApplicationUser.cs
@@ -21,6 +21,9 @@ namespace Yavsc.Models
         [InverseProperty("Owner")]
         public virtual List<Contact> Book { get; set; }
 
+        [InverseProperty("DeviceOwner")]
+        public virtual List<GoogleCloudMobileDeclaration> Devices { get; set; }
+        
         [InverseProperty("Owner")]
 
         public virtual List<Circle> Circles { get; set; }
diff --git a/Yavsc/src/Model/Identity/MobileAppDeclaration.cs b/Yavsc/src/Model/Identity/MobileAppDeclaration.cs
index 2a838a7e..ec886f5f 100644
--- a/Yavsc/src/Model/Identity/MobileAppDeclaration.cs
+++ b/Yavsc/src/Model/Identity/MobileAppDeclaration.cs
@@ -1,13 +1,15 @@
 using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using Yavsc.Models;
 
 public class GoogleCloudMobileDeclaration {
-
     [Key]
 
     public string RegistrationId { get; set; }
-
-    public string AuthToken { get; set; }
-
-    public string AuthType { get; set; }
+    
+    public string DeviceOwnerId { get; set; }
+    
+    [ForeignKeyAttribute("DeviceOwnerId")]
+    public virtual ApplicationUser DeviceOwner { get; set; }
 
 }
diff --git a/Yavsc/src/Providers/OAuthProvider.cs b/Yavsc/src/Providers/OAuthProvider.cs
index a60b32c8..26cca142 100644
--- a/Yavsc/src/Providers/OAuthProvider.cs
+++ b/Yavsc/src/Providers/OAuthProvider.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using AspNet.Security.OpenIdConnect.Extensions;
@@ -122,7 +123,16 @@ namespace Yavsc.Providers {
 
             context.Validated();
         }
-
-
+        
+        /// <summary>
+        /// List provided offline access tokens, to a given
+        /// user by its id
+        /// </summary>
+        /// <param name="userid"></param>
+        /// <returns></returns>
+        public List<string> GetOfflineTokens(string userid) {
+            
+            throw new NotImplementedException();
+        }
     }
 }
\ No newline at end of file