diff --git a/lib/intercom-rails/config.rb b/lib/intercom-rails/config.rb
index 78e761f..925e778 100644
--- a/lib/intercom-rails/config.rb
+++ b/lib/intercom-rails/config.rb
@@ -110,7 +110,6 @@ def self.reset!
     config_accessor :hide_default_launcher
     config_accessor :api_base
     config_accessor :encrypted_mode
-    config_accessor :jwt_enabled
 
     def self.api_key=(*)
       warn "Setting an Intercom API key is no longer supported; remove the `config.api_key = ...` line from config/initializers/intercom.rb"
@@ -144,6 +143,15 @@ def self.company_association=(*)
       end
     end
 
+    config_group :jwt do
+      config_accessor :enabled
+      config_accessor :signed_user_fields do |value|
+        unless value.nil? || (value.kind_of?(Array) && value.all? { |v| v.kind_of?(Symbol) || v.kind_of?(String) })
+          raise ArgumentError, "jwt.signed_user_fields must be an array of symbols or strings"
+        end
+      end
+    end
+
   end
 
 end
diff --git a/lib/intercom-rails/script_tag.rb b/lib/intercom-rails/script_tag.rb
index cc1eea6..c482b29 100644
--- a/lib/intercom-rails/script_tag.rb
+++ b/lib/intercom-rails/script_tag.rb
@@ -26,7 +26,7 @@ def initialize(options = {})
       self.controller = options[:controller]
       @show_everywhere = options[:show_everywhere]
       @session_duration = session_duration_from_config
-      self.jwt_enabled = options[:jwt_enabled] || Config.jwt_enabled
+      self.jwt_enabled = options[:jwt_enabled] || Config.jwt.enabled
 
       initial_user_details = if options[:find_current_user_details]
         find_current_user_details
@@ -128,6 +128,14 @@ def generate_jwt
         user_id: user_details[:user_id].to_s,
         exp: 24.hours.from_now.to_i
       }
+
+      if Config.jwt.signed_user_fields.present?
+        Config.jwt.signed_user_fields.each do |field|
+          field = field.to_sym
+          payload[field] = user_details[field].to_s if user_details[field].present?
+        end
+      end
+
       JWT.encode(payload, secret, 'HS256')
     end
 
@@ -139,7 +147,11 @@ def user_details=(user_details)
         if secret.present?
           if jwt_enabled && u[:user_id].present?
             u[:intercom_user_jwt] ||= generate_jwt
-            u.delete(:user_id)  # No need to send plaintext user_id when using JWT
+            
+            u.delete(:user_id)
+            Config.jwt.signed_user_fields&.each do |field|
+              u.delete(field.to_sym)
+            end
           elsif (u[:user_id] || u[:email]).present?
             u[:user_hash] ||= user_hash
           end
diff --git a/spec/config_spec.rb b/spec/config_spec.rb
index 359e541..2f3c027 100644
--- a/spec/config_spec.rb
+++ b/spec/config_spec.rb
@@ -115,20 +115,48 @@
     end.to output(/no longer supported/).to_stderr
   end
 
-  it 'gets/sets jwt_enabled' do
-    IntercomRails.config.jwt_enabled = true
-    expect(IntercomRails.config.jwt_enabled).to eq(true)
-  end
+  context 'jwt configuration' do
 
-  it 'defaults jwt_enabled to nil' do
-    IntercomRails.config.reset!
-    expect(IntercomRails.config.jwt_enabled).to eq(nil)
-  end
+    it 'gets/sets jwt_enabled' do
+      IntercomRails.config.jwt.enabled = true
+      expect(IntercomRails.config.jwt.enabled).to eq(true)
+    end
 
-  it 'allows jwt_enabled in block form' do
-    IntercomRails.config do |config|
-      config.jwt_enabled = true
+    it 'defaults jwt_enabled to nil' do
+      IntercomRails.config.reset!
+      expect(IntercomRails.config.jwt.enabled).to eq(nil)
+    end
+
+    it 'allows jwt_enabled in block form' do
+      IntercomRails.config do |config|
+        config.jwt.enabled = true
+      end
+      expect(IntercomRails.config.jwt.enabled).to eq(true)
+    end\
+
+    it 'gets/sets signed_user_fields' do
+      IntercomRails.config.jwt.signed_user_fields = [:email, :name]
+      expect(IntercomRails.config.jwt.signed_user_fields).to eq([:email, :name])
+    end
+
+    it 'validates signed_user_fields is an array of symbols or strings' do
+      expect { 
+        IntercomRails.config.jwt.signed_user_fields = "not_an_array"
+      }.to raise_error(ArgumentError)
+
+      expect { 
+        IntercomRails.config.jwt.signed_user_fields = [1, 2, 3]
+      }.to raise_error(ArgumentError)
+
+      expect { 
+        IntercomRails.config.jwt.signed_user_fields = [:email, "name", :custom_field]
+      }.not_to raise_error
+    end
+
+    it 'allows nil signed_user_fields' do
+      expect { 
+        IntercomRails.config.jwt.signed_user_fields = nil
+      }.not_to raise_error
     end
-    expect(IntercomRails.config.jwt_enabled).to eq(true)
   end
 end
diff --git a/spec/script_tag_helper_spec.rb b/spec/script_tag_helper_spec.rb
index 04134b2..95fabfe 100644
--- a/spec/script_tag_helper_spec.rb
+++ b/spec/script_tag_helper_spec.rb
@@ -59,7 +59,7 @@
     end
 
     it 'enables JWT when configured' do
-      IntercomRails.config.jwt_enabled = true
+      IntercomRails.config.jwt.enabled = true
       output = intercom_script_tag({
         user_id: '1234',
         email: 'test@example.com'
@@ -70,7 +70,7 @@
     end
 
     it 'falls back to user_hash when JWT is disabled' do
-      IntercomRails.config.jwt_enabled = false
+      IntercomRails.config.jwt.enabled = false
       output = intercom_script_tag({
         user_id: '1234',
         email: 'test@example.com'
diff --git a/spec/script_tag_spec.rb b/spec/script_tag_spec.rb
index 0df492d..a7273fd 100644
--- a/spec/script_tag_spec.rb
+++ b/spec/script_tag_spec.rb
@@ -393,6 +393,80 @@ def user
       expect(script_tag.intercom_settings[:email]).to eq('test@example.com')
       expect(script_tag.intercom_settings[:name]).to eq('Test User')
     end
+
+    context 'with signed_user_fields' do
+      before do
+        IntercomRails.config.jwt.signed_user_fields = [:email, :name, :plan, :team_id]
+      end
+
+      it 'includes configured fields in JWT when present' do
+        script_tag = ScriptTag.new(
+          user_details: { 
+            user_id: '1234',
+            email: 'test@example.com',
+            plan: 'pro',
+            team_id: 'team_123',
+            company_size: 100
+          },
+          jwt_enabled: true
+        )
+        
+        jwt = script_tag.intercom_settings[:intercom_user_jwt]
+        decoded_payload = JWT.decode(jwt, 'super-secret', true, { algorithm: 'HS256' })[0]
+        
+        expect(decoded_payload['user_id']).to eq('1234')
+        expect(decoded_payload['email']).to eq('test@example.com')
+        expect(decoded_payload['plan']).to eq('pro')
+        expect(decoded_payload['team_id']).to eq('team_123')
+        expect(decoded_payload['company_size']).to be_nil
+        
+        expect(script_tag.intercom_settings[:user_id]).to be_nil
+        expect(script_tag.intercom_settings[:email]).to be_nil
+        expect(script_tag.intercom_settings[:plan]).to be_nil
+        expect(script_tag.intercom_settings[:team_id]).to be_nil
+        expect(script_tag.intercom_settings[:company_size]).to eq(100)
+      end
+
+      it 'handles missing configured fields gracefully' do
+        script_tag = ScriptTag.new(
+          user_details: { 
+            user_id: '1234',
+            email: 'test@example.com'
+          },
+          jwt_enabled: true
+        )
+        
+        jwt = script_tag.intercom_settings[:intercom_user_jwt]
+        decoded_payload = JWT.decode(jwt, 'super-secret', true, { algorithm: 'HS256' })[0]
+        
+        expect(decoded_payload['user_id']).to eq('1234')
+        expect(decoded_payload['email']).to eq('test@example.com')
+        expect(decoded_payload['name']).to be_nil
+      end
+    
+      it 'respects empty signed_user_fields configuration' do
+        IntercomRails.config.jwt.signed_user_fields = []
+        script_tag = ScriptTag.new(
+          user_details: { 
+            user_id: '1234',
+            email: 'test@example.com',
+            name: 'Test User'
+          },
+          jwt_enabled: true
+        )
+        
+        jwt = script_tag.intercom_settings[:intercom_user_jwt]
+        decoded_payload = JWT.decode(jwt, 'super-secret', true, { algorithm: 'HS256' })[0]
+        
+        expect(decoded_payload['user_id']).to eq('1234')
+        expect(decoded_payload['email']).to be_nil
+        expect(decoded_payload['name']).to be_nil
+        
+
+        expect(script_tag.intercom_settings[:email]).to eq('test@example.com')
+        expect(script_tag.intercom_settings[:name]).to eq('Test User')
+      end
+    end
   end
 
 end