diff --git a/lib/facebook_ads/ad_objects/server_side/user_data.rb b/lib/facebook_ads/ad_objects/server_side/user_data.rb
index e3d1d063..1a542cb4 100644
--- a/lib/facebook_ads/ad_objects/server_side/user_data.rb
+++ b/lib/facebook_ads/ad_objects/server_side/user_data.rb
@@ -198,6 +198,10 @@ def external_id=(external_id)
       # The lead ID for the user in this transaction. This ID is associated with a lead generated by Facebook's Lead Ads.
       attr_accessor :lead_id
 
+      # The ID issued by Meta when a person first logs into an instance of an app.
+      # Also known as the App-Scoped ID. This value must not be hashed.
+      attr_accessor :fb_login_id
+
       # The first 5 letters of the first name.
       attr_accessor :f5first
 
@@ -271,6 +275,7 @@ def madid=(madid)
       # @param [String] fbp
       # @param [String] subscription_id
       # @param [String] lead_id
+      # @param [String] fb_login_id
       # @param [String] f5first
       # @param [String] f5last
       # @param [String] fi
@@ -288,7 +293,7 @@ def initialize(email: nil, emails: nil, phone: nil, phones: nil, gender: nil, ge
                      first_name: nil, first_names: nil, city: nil, cities: nil, state: nil, states: nil,
                      country_code: nil, country_codes: nil, zip_code: nil, zip_codes: nil,
                      external_id: nil, external_ids: nil, client_ip_address: nil,
-                     client_user_agent: nil, fbc: nil, fbp: nil, subscription_id: nil, lead_id: nil,
+                     client_user_agent: nil, fbc: nil, fbp: nil, subscription_id: nil, lead_id: nil, fb_login_id: nil,
                      f5first: nil, f5last: nil, fi: nil, dobd: nil, dobm: nil, doby: nil, anon_id: nil, anon_ids: nil, madid:nil, madids: nil,
                      ctwa_clid: nil, page_id: nil)
         validate_constructor_values(emails, email, 'emails', 'email')
@@ -387,6 +392,9 @@ def initialize(email: nil, emails: nil, phone: nil, phones: nil, gender: nil, ge
         unless lead_id.nil?
           self.lead_id = lead_id
         end
+        unless fb_login_id.nil?
+          self.fb_login_id = fb_login_id
+        end
         unless f5first.nil?
           self.f5first = f5first
         end
@@ -518,6 +526,9 @@ def build(attributes = {})
         if attributes.has_key?(:'lead_id')
           self.lead_id = attributes[:'lead_id']
         end
+        if attributes.has_key?(:'fb_login_id')
+          self.fb_login_id = attributes[:'fb_login_id']
+        end
 
         if attributes.has_key?(:'f5first')
           self.f5first = attributes[:'f5first']
@@ -585,6 +596,7 @@ def ==(o)
             fbp == o.fbp &&
             subscription_id == o.subscription_id &&
             lead_id == o.lead_id &&
+            fb_login_id == o.fb_login_id &&
             f5first == o.f5first &&
             f5last == o.f5last &&
             fi == o.fi &&
@@ -623,6 +635,7 @@ def hash
             fbp,
             subscription_id,
             lead_id,
+            fb_login_id,
             f5first,
             f5last,
             fi,
@@ -692,6 +705,9 @@ def to_s
         unless lead_id.nil?
           hash['lead_id'] = lead_id
         end
+        unless fb_login_id.nil?
+          hash['fb_login_id'] = fb_login_id
+        end
         unless f5first.nil?
           hash['f5first'] = f5first
         end
@@ -780,6 +796,9 @@ def normalize
         unless lead_id.nil?
           hash['lead_id'] = lead_id
         end
+        unless fb_login_id.nil?
+          hash['fb_login_id'] = fb_login_id
+        end
         unless f5first.nil?
           hash['f5first'] = FacebookAds::ServerSide::Util.normalize(f5first, 'f5first')
         end
diff --git a/spec/lib/facebook_ads/ad_objects/server_side/user_data_spec.rb b/spec/lib/facebook_ads/ad_objects/server_side/user_data_spec.rb
index e7c8613f..ad65b64d 100644
--- a/spec/lib/facebook_ads/ad_objects/server_side/user_data_spec.rb
+++ b/spec/lib/facebook_ads/ad_objects/server_side/user_data_spec.rb
@@ -30,6 +30,7 @@
             state: 'state-9',
             zip_code: 'zip-code-10',
             external_id: 'external-id-100',
+            fb_login_id: 'fb-login-id-111',
             f5first: 'f5first-11',
             lead_id: 'lead_id-112',
             f5last: 'f5last-12',
@@ -57,6 +58,7 @@
             'zp' => ["zp_#{attrs[:zip_code]}-normalized"],
             'external_id' => [attrs[:external_id]],
             'lead_id' => attrs[:lead_id],
+            'fb_login_id' => attrs[:fb_login_id],
             'f5first' => "f5first_#{attrs[:f5first]}-normalized",
             'f5last' => "f5last_#{attrs[:f5last]}-normalized",
             'fi' => "fi_#{attrs[:fi]}-normalized",
@@ -119,6 +121,7 @@
             state: 'state-9',
             zip_code: 'zip-code-10',
             lead_id: 'lead-id-100',
+            fb_login_id: 'fb-login-id-101',
             f5first: 'f5first-11',
             f5last: 'f5last-12',
             fi: 'fi-13',
@@ -138,6 +141,7 @@
             state: 'state-9',
             zip_code: 'zip-code-10',
             lead_id: 'lead-id-100',
+            fb_login_id: 'fb-login-id-101',
             f5first: 'f5first-11',
             f5last: 'f5last-12',
             fi: 'fi-13',
@@ -167,6 +171,7 @@
             state: 'state-9',
             zip_code: 'zip-code-10',
             lead_id: 'lead-id-100',
+            fb_login_id: 'fb-login-id-101',
             f5first: 'f5first-11',
             f5last: 'f5last-12',
             fi: 'fi-13',
@@ -186,6 +191,7 @@
             state: 'state-9',
             zip_code: 'zip-code-10',
             lead_id: 'lead-id-100',
+            # fb_login_id intentionally omitted to trigger inequality
             f5first: 'f5first-11',
             f5last: 'f5last-12',
             fi: 'fi-13',
@@ -265,11 +271,13 @@
         attrs = {
             city: 'seattle',
             cities: ['menlopark', 'paloalto'],
+            fb_login_id: 'fb-login-id-500',
         }
         user_data.build(attrs)
 
         expect(user_data.city).to eq(attrs[:cities][0])
         expect(user_data.cities).to eq(attrs[:cities])
+        expect(user_data.fb_login_id).to eq(attrs[:fb_login_id])
     end
 
     it 'constructor fails validation if both single and multi-values are specified' do