diff --git a/Interfaces/IXIdentityBaseReferencedProvider.cs b/Interfaces/IXIdentityBaseReferencedProvider.cs
index 09264c9..4aa225a 100644
--- a/Interfaces/IXIdentityBaseReferencedProvider.cs
+++ b/Interfaces/IXIdentityBaseReferencedProvider.cs
@@ -24,11 +24,6 @@ namespace xIdentityService.Interfaces
         string Provider { get; }
         #endregion
 
-        //
-        #region Identifier ...
-        Task<int> LastIndex(TKey providedForId);
-        #endregion
-
         //
         #region Referenced Actions ...
         /// <summary>
@@ -49,6 +44,13 @@ namespace xIdentityService.Interfaces
         /// <returns></returns>
         Task<IEnumerable<TModel>> GetAllReferences(TKey providedForId);
 
+        /// <summary>
+        /// Count References ...
+        /// </summary>
+        /// <param name="providedForId"></param>
+        /// <returns></returns>
+        Task<int> CountReferences(TKey providedForId);
+
         /// <summary>
         /// Retrieve References of Specific Provided ID as Query ...
         /// </summary>
@@ -64,14 +66,12 @@ namespace xIdentityService.Interfaces
         /// </summary>
         /// <param name="model"></param>
         /// <param name="providedForId"></param>
-        /// <param name="forIndex"></param>
         /// <param name="connectionId"></param>
         /// <param name="userInfo"></param>
         /// <returns></returns>
         Task<bool> AddReference(
             TModel model,
             TKey providedForId,
-            int forIndex = 0,
             string connectionId = null,
             XUserClaimsInfoDto userInfo = null
         );
@@ -96,14 +96,12 @@ namespace xIdentityService.Interfaces
         /// </summary>
         /// <param name="model"></param>
         /// <param name="providedForId"></param>
-        /// <param name="forIndex">if null, removes all</param>
         /// <param name="connectionId"></param>
         /// <param name="userInfo"></param>
         /// <returns></returns>
         Task<bool> RemoveReference(
             TModel model,
             TKey providedForId,
-            int? forIndex = null,
             string connectionId = null,
             XUserClaimsInfoDto userInfo = null
         );