diff --git a/devices/serializers.py b/devices/serializers.py
index 5ef6471..c9f3631 100644
--- a/devices/serializers.py
+++ b/devices/serializers.py
@@ -2,7 +2,6 @@ from rest_framework import serializers
 from .models import Device
 from api.serializers import CustomReadOnlyUserSerializer
 from billing.models import Payment  # Import the Payment model
-from django.utils import timezone
 
 
 class CreateDeviceSerializer(serializers.ModelSerializer):
@@ -33,6 +32,15 @@ class BlockDeviceSerializer(serializers.ModelSerializer):
 
 class DeviceSerializer(serializers.ModelSerializer):
     user = serializers.SerializerMethodField()
+    pending_payment_id = serializers.SerializerMethodField()
+
+    def get_pending_payment_id(self, obj):
+        unpaid_payment = (
+            Payment.objects.filter(devices=obj, paid=False)
+            .order_by("-created_at")
+            .first()
+        )
+        return unpaid_payment.id if unpaid_payment else None
 
     def get_user(self, obj):
         user = obj.user