diff --git a/core/apps/orders/migrations/0002_remove_order_pharmacy_order_factory.py b/core/apps/orders/migrations/0002_remove_order_pharmacy_order_factory.py
new file mode 100644
index 0000000..ec300ef
--- /dev/null
+++ b/core/apps/orders/migrations/0002_remove_order_pharmacy_order_factory.py
@@ -0,0 +1,24 @@
+# Generated by Django 5.2 on 2025-11-27 10:24
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orders', '0001_initial'),
+        ('shared', '0010_factory'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='order',
+            name='pharmacy',
+        ),
+        migrations.AddField(
+            model_name='order',
+            name='factory',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='orders', to='shared.factory'),
+        ),
+    ]
diff --git a/core/apps/orders/migrations/0003_order_overdue_price.py b/core/apps/orders/migrations/0003_order_overdue_price.py
new file mode 100644
index 0000000..5637360
--- /dev/null
+++ b/core/apps/orders/migrations/0003_order_overdue_price.py
@@ -0,0 +1,18 @@
+# Generated by Django 5.2 on 2025-11-27 10:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orders', '0002_remove_order_pharmacy_order_factory'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='order',
+            name='overdue_price',
+            field=models.DecimalField(decimal_places=2, default=0, max_digits=15),
+        ),
+    ]
diff --git a/core/apps/orders/models/order.py b/core/apps/orders/models/order.py
index 0d7bc2f..959f7ee 100644
--- a/core/apps/orders/models/order.py
+++ b/core/apps/orders/models/order.py
@@ -1,7 +1,7 @@
 from django.db import models
 
 # shared
-from core.apps.shared.models import BaseModel, Pharmacy
+from core.apps.shared.models import BaseModel, Factory
 # accounts
 from core.apps.accounts.models import User
 
@@ -9,13 +9,17 @@ from core.apps.accounts.models import User
 
 class Order(BaseModel):
     user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='orders')
-    pharmacy = models.ForeignKey(Pharmacy, on_delete=models.CASCADE, related_name='orders')
+    factory = models.ForeignKey(Factory, on_delete=models.CASCADE, related_name='orders', null=True)
 
     total_price = models.DecimalField(decimal_places=2, max_digits=15)
     paid_price = models.DecimalField(decimal_places=2, max_digits=15)
+    overdue_price = models.DecimalField(decimal_places=2, max_digits=15, default=0)
     advance = models.FloatField()
     employee_name = models.CharField(max_length=200)
 
     def __str__(self):
         return f'#{self.id} from {self.user.first_name}, total_price - {self.total_price}, paid - {self.paid_price}'
-    
\ No newline at end of file
+    
+    def save(self, *args, **kwargs):
+        self.overdue_price = self.total_price - self.paid_price
+        return super().save(*args, **kwargs)
\ No newline at end of file
diff --git a/core/apps/orders/serializers/order.py b/core/apps/orders/serializers/order.py
index fe125ee..6bcedfe 100644
--- a/core/apps/orders/serializers/order.py
+++ b/core/apps/orders/serializers/order.py
@@ -8,11 +8,11 @@ from rest_framework import serializers
 from core.apps.orders.models import Order, OrderItem
 from core.apps.orders.serializers.order_item import OrderItemSerializer
 # shared
-from core.apps.shared.models import Pharmacy
+from core.apps.shared.models import Factory
 
 
 class OrderCreateSerializer(serializers.Serializer):
-    pharmacy_id = serializers.IntegerField()
+    factory_id = serializers.IntegerField()
     paid_price = serializers.DecimalField(max_digits=15, decimal_places=2)
     total_price = serializers.DecimalField(max_digits=15, decimal_places=2)
     advance = serializers.FloatField()
@@ -20,16 +20,16 @@ class OrderCreateSerializer(serializers.Serializer):
     items = OrderItemSerializer(many=True)
 
     def validate(self, data):
-        pharmacy = Pharmacy.objects.filter(id=data['pharmacy_id']).first()
-        if not pharmacy:
-            raise serializers.ValidationError({"pharmancy_id": "Pharmancy not found"})
-        data['pharmacy'] = pharmacy
+        factory = Factory.objects.filter(id=data['factory_id']).first()
+        if not factory:
+            raise serializers.ValidationError({"factory_id": "Factory not found"})
+        data['factory'] = factory
         return data
     
     def create(self, validated_data):
         with transaction.atomic():
             order = Order.objects.create(
-                pharmacy=validated_data.get('pharmacy'),
+                factory=validated_data.get('factory'),
                 paid_price=validated_data.get('paid_price'),
                 advance=validated_data.get('advance'),
                 employee_name=validated_data.get('employee_name'),
@@ -49,14 +49,21 @@ class OrderCreateSerializer(serializers.Serializer):
     
 class OrderListSerializer(serializers.ModelSerializer):
     order_items = OrderItemSerializer(many=True)
-    
+    factory = serializers.SerializerMethodField(method_name='get_factory')
+
     class Meta:
         model = Order
         fields = [
-            'id', 'pharmacy', 'total_price', 'paid_price', 'advance', 'employee_name',
-            'order_items'
+            'id', 'factory', 'total_price', 'paid_price', 'advance', 'employee_name',
+            'overdue_price', 'order_items'
         ]
 
+    def get_factory(self, obj):
+        return {
+            'id': obj.factory.id,
+            'name': obj.factory.name,
+        }
+
 
 class OrderUpdateSerializer(serializers.Serializer):
     paid_price = serializers.IntegerField()