diff --git a/Packages/Federation.Sdk.Contracts/Source/Filtering/GroupFilters.cs b/Packages/Federation.Sdk.Contracts/Source/Filtering/GroupFilters.cs
new file mode 100644
index 0000000..655b682
--- /dev/null
+++ b/Packages/Federation.Sdk.Contracts/Source/Filtering/GroupFilters.cs
@@ -0,0 +1,77 @@
+namespace HttpsRichardy.Federation.Sdk.Contracts.Filtering;
+
+public sealed class GroupFilters
+{
+    internal string? Id { get; private set; }
+    internal string? RealmId { get; private set; }
+    internal string? Name { get; private set; }
+
+    internal bool? IsDeleted { get; private set; }
+
+    internal DateOnly? CreatedAfter { get; private set; }
+    internal DateOnly? CreatedBefore { get; private set; }
+
+    public GroupFilters WithIdentifier(string identifier)
+    {
+        if (!string.IsNullOrWhiteSpace(identifier))
+        {
+            Id = identifier.Trim();
+        }
+
+        return this;
+    }
+
+    public GroupFilters WithRealmId(string realmId)
+    {
+        if (!string.IsNullOrWhiteSpace(realmId))
+        {
+            RealmId = realmId.Trim();
+        }
+
+        return this;
+    }
+
+    public GroupFilters WithName(string name)
+    {
+        if (!string.IsNullOrWhiteSpace(name))
+        {
+            Name = name.Trim();
+        }
+
+        return this;
+    }
+
+    public GroupFilters WithIsDeleted(bool? isDeleted)
+    {
+        IsDeleted = isDeleted;
+        return this;
+    }
+
+    public GroupFilters WithCreatedAfter(DateOnly? createdAfter)
+    {
+        CreatedAfter = createdAfter;
+        return this;
+    }
+
+    public GroupFilters WithCreatedBefore(DateOnly? createdBefore)
+    {
+        CreatedBefore = createdBefore;
+        return this;
+    }
+
+    public static GroupsFetchParameters WithoutFilters => new();
+    public static GroupFilters AsBuilder() => new();
+
+    public GroupsFetchParameters Build()
+    {
+        return new GroupsFetchParameters
+        {
+            Id = Id,
+            RealmId = RealmId,
+            Name = Name,
+            IsDeleted = IsDeleted,
+            CreatedAfter = CreatedAfter,
+            CreatedBefore = CreatedBefore
+        };
+    }
+}
diff --git a/Packages/Federation.Sdk.Contracts/Source/Filtering/GroupPermissionsFilters.cs b/Packages/Federation.Sdk.Contracts/Source/Filtering/GroupPermissionsFilters.cs
new file mode 100644
index 0000000..78ad123
--- /dev/null
+++ b/Packages/Federation.Sdk.Contracts/Source/Filtering/GroupPermissionsFilters.cs
@@ -0,0 +1,52 @@
+namespace HttpsRichardy.Federation.Sdk.Contracts.Filtering;
+
+public sealed class GroupPermissionsFilters
+{
+    internal string? PermissionName { get; private set; }
+
+    internal int PageNumber { get; private set; } = 1;
+    internal int PageSize { get; private set; } = 60;
+
+    public GroupPermissionsFilters WithPermissionName(string permissionName)
+    {
+        if (!string.IsNullOrWhiteSpace(permissionName))
+        {
+            PermissionName = permissionName.Trim();
+        }
+
+        return this;
+    }
+
+    public GroupPermissionsFilters WithPageNumber(int pageNumber)
+    {
+        if (pageNumber > 0)
+        {
+            PageNumber = pageNumber;
+        }
+
+        return this;
+    }
+
+    public GroupPermissionsFilters WithPageSize(int pageSize)
+    {
+        if (pageSize > 0)
+        {
+            PageSize = pageSize;
+        }
+
+        return this;
+    }
+
+    public static ListGroupPermissionsParameters WithoutFilters => new();
+    public static GroupPermissionsFilters AsBuilder() => new();
+
+    public ListGroupPermissionsParameters Build()
+    {
+        return new ListGroupPermissionsParameters
+        {
+            PermissionName = PermissionName,
+            PageNumber = PageNumber,
+            PageSize = PageSize
+        };
+    }
+}
diff --git a/Packages/Federation.Sdk.Contracts/Source/Filtering/PermissionFilters.cs b/Packages/Federation.Sdk.Contracts/Source/Filtering/PermissionFilters.cs
new file mode 100644
index 0000000..d29f9f1
--- /dev/null
+++ b/Packages/Federation.Sdk.Contracts/Source/Filtering/PermissionFilters.cs
@@ -0,0 +1,60 @@
+namespace HttpsRichardy.Federation.Sdk.Contracts.Filtering;
+
+public sealed class PermissionFilters
+{
+    internal string? Name { get; private set; }
+    internal bool IncludeDeleted { get; private set; } = false;
+
+    internal int PageNumber { get; private set; } = 1;
+    internal int PageSize { get; private set; } = 20;
+
+    public PermissionFilters WithName(string name)
+    {
+        if (!string.IsNullOrWhiteSpace(name))
+        {
+            Name = name.Trim();
+        }
+
+        return this;
+    }
+
+    public PermissionFilters WithIncludeDeleted(bool includeDeleted)
+    {
+        IncludeDeleted = includeDeleted;
+        return this;
+    }
+
+    public PermissionFilters WithPageNumber(int pageNumber)
+    {
+        if (pageNumber > 0)
+        {
+            PageNumber = pageNumber;
+        }
+
+        return this;
+    }
+
+    public PermissionFilters WithPageSize(int pageSize)
+    {
+        if (pageSize > 0)
+        {
+            PageSize = pageSize;
+        }
+
+        return this;
+    }
+
+    public static PermissionsFetchParameters WithoutFilters => new();
+    public static PermissionFilters AsBuilder() => new();
+
+    public PermissionsFetchParameters Build()
+    {
+        return new PermissionsFetchParameters
+        {
+            Name = Name,
+            IncludeDeleted = IncludeDeleted,
+            PageNumber = PageNumber,
+            PageSize = PageSize
+        };
+    }
+}
diff --git a/Packages/Federation.Sdk.Contracts/Source/Filtering/RealmFilters.cs b/Packages/Federation.Sdk.Contracts/Source/Filtering/RealmFilters.cs
new file mode 100644
index 0000000..de9f05f
--- /dev/null
+++ b/Packages/Federation.Sdk.Contracts/Source/Filtering/RealmFilters.cs
@@ -0,0 +1,73 @@
+namespace HttpsRichardy.Federation.Sdk.Contracts.Filtering;
+
+public sealed class RealmFilters
+{
+    internal string? Id { get; private set; }
+    internal string? Name { get; private set; }
+
+    internal bool? IncludeDeleted { get; private set; }
+
+    internal int PageNumber { get; private set; } = 1;
+    internal int PageSize { get; private set; } = 20;
+
+    public RealmFilters WithIdentifier(string identifier)
+    {
+        if (!string.IsNullOrWhiteSpace(identifier))
+        {
+            Id = identifier.Trim();
+        }
+
+        return this;
+    }
+
+    public RealmFilters WithName(string name)
+    {
+        if (!string.IsNullOrWhiteSpace(name))
+        {
+            Name = name.Trim();
+        }
+
+        return this;
+    }
+
+    public RealmFilters WithIncludeDeleted(bool? includeDeleted)
+    {
+        IncludeDeleted = includeDeleted;
+        return this;
+    }
+
+    public RealmFilters WithPageNumber(int pageNumber)
+    {
+        if (pageNumber > 0)
+        {
+            PageNumber = pageNumber;
+        }
+
+        return this;
+    }
+
+    public RealmFilters WithPageSize(int pageSize)
+    {
+        if (pageSize > 0)
+        {
+            PageSize = pageSize;
+        }
+
+        return this;
+    }
+
+    public static RealmFetchParameters WithoutFilters => new();
+    public static RealmFilters AsBuilder() => new();
+
+    public RealmFetchParameters Build()
+    {
+        return new RealmFetchParameters
+        {
+            Id = Id,
+            Name = Name,
+            IncludeDeleted = IncludeDeleted,
+            PageNumber = PageNumber,
+            PageSize = PageSize
+        };
+    }
+}
diff --git a/Packages/Federation.Sdk.Contracts/Source/Filtering/UserFilters.cs b/Packages/Federation.Sdk.Contracts/Source/Filtering/UserFilters.cs
new file mode 100644
index 0000000..f94b3a1
--- /dev/null
+++ b/Packages/Federation.Sdk.Contracts/Source/Filtering/UserFilters.cs
@@ -0,0 +1,73 @@
+namespace HttpsRichardy.Federation.Sdk.Contracts.Filtering;
+
+public sealed class UserFilters
+{
+    internal string? Id { get; private set; }
+    internal string? Username { get; private set; }
+
+    internal bool? IsDeleted { get; private set; }
+
+    internal int PageNumber { get; private set; } = 1;
+    internal int PageSize { get; private set; } = 60;
+
+    public UserFilters WithIdentifier(string identifier)
+    {
+        if (!string.IsNullOrWhiteSpace(identifier))
+        {
+            Id = identifier.Trim();
+        }
+
+        return this;
+    }
+
+    public UserFilters WithUsername(string username)
+    {
+        if (!string.IsNullOrWhiteSpace(username))
+        {
+            Username = username.Trim();
+        }
+
+        return this;
+    }
+
+    public UserFilters WithIsDeleted(bool? isDeleted)
+    {
+        IsDeleted = isDeleted;
+        return this;
+    }
+
+    public UserFilters WithPageNumber(int pageNumber)
+    {
+        if (pageNumber > 0)
+        {
+            PageNumber = pageNumber;
+        }
+
+        return this;
+    }
+
+    public UserFilters WithPageSize(int pageSize)
+    {
+        if (pageSize > 0)
+        {
+            PageSize = pageSize;
+        }
+
+        return this;
+    }
+
+    public static UsersFetchParameters WithoutFilters => new();
+    public static UserFilters AsBuilder() => new();
+
+    public UsersFetchParameters Build()
+    {
+        return new UsersFetchParameters
+        {
+            Id = Id,
+            Username = Username,
+            IsDeleted = IsDeleted,
+            PageNumber = PageNumber,
+            PageSize = PageSize
+        };
+    }
+}
diff --git a/Packages/Federation.Sdk.Contracts/Source/Filtering/UserGroupsFilters.cs b/Packages/Federation.Sdk.Contracts/Source/Filtering/UserGroupsFilters.cs
new file mode 100644
index 0000000..03d21e5
--- /dev/null
+++ b/Packages/Federation.Sdk.Contracts/Source/Filtering/UserGroupsFilters.cs
@@ -0,0 +1,39 @@
+namespace HttpsRichardy.Federation.Sdk.Contracts.Filtering;
+
+public sealed class UserGroupsFilters
+{
+    internal int PageNumber { get; private set; } = 1;
+    internal int PageSize { get; private set; } = 60;
+
+    public UserGroupsFilters WithPageNumber(int pageNumber)
+    {
+        if (pageNumber > 0)
+        {
+            PageNumber = pageNumber;
+        }
+
+        return this;
+    }
+
+    public UserGroupsFilters WithPageSize(int pageSize)
+    {
+        if (pageSize > 0)
+        {
+            PageSize = pageSize;
+        }
+
+        return this;
+    }
+
+    public static ListUserAssignedGroupsParameters WithoutFilters => new();
+    public static UserGroupsFilters AsBuilder() => new();
+
+    public ListUserAssignedGroupsParameters Build()
+    {
+        return new ListUserAssignedGroupsParameters
+        {
+            PageNumber = PageNumber,
+            PageSize = PageSize
+        };
+    }
+}
diff --git a/Packages/Federation.Sdk/Source/Helpers/QueryParametersHelper.cs b/Packages/Federation.Sdk/Source/Helpers/QueryParametersHelper.cs
index 2bdbd10..11b3e3c 100644
--- a/Packages/Federation.Sdk/Source/Helpers/QueryParametersHelper.cs
+++ b/Packages/Federation.Sdk/Source/Helpers/QueryParametersHelper.cs
@@ -13,7 +13,8 @@ public static string ToQueryString<TParameters>(TParameters instance)
         foreach (var property in properties)
         {
             var value = property.GetValue(instance);
-            if (value is null) continue;
+            if (value is null)
+                continue;
 
             string name = ToCamelCase(property.Name);
             string stringValue = value switch