Refactor UpdatePaymentSerializer to include only number_of_months field, add DeletePaymentView for payment deletion, and enhance VerifyPaymentView with payment_id lookup. Introduce pending_payment_id field in DeviceSerializer to track unpaid payments.

billing/serializers.py

@@ -14,9 +14,6 @@ class PaymentSerializer(serializers.ModelSerializer):
 class UpdatePaymentSerializer(serializers.ModelSerializer):
     class Meta:
         model = Payment
-        fields = ["paid", "paid_at", "method", "number_of_months"]
+        fields = [
-
+            "number_of_months",
-    paid = serializers.BooleanField(required=True, allow_null=True)
+        ]
-    paid_at = serializers.DateTimeField(required=True, allow_null=True)
-    method = serializers.ChoiceField(choices=Payment.PAYMENT_TYPES, required=True)
-    number_of_months = serializers.IntegerField(required=True, allow_null=True)

billing/urls.py

@@ -5,6 +5,7 @@ from .views import (
     VerifyPaymentView,
     PaymentDetailAPIView,
     UpdatePaymentAPIView,
+    DeletePaymentView,
 )
 
 urlpatterns = [
@@ -15,5 +16,12 @@ urlpatterns = [
         UpdatePaymentAPIView.as_view(),
         name="update-payment",
     ),
-    path("verify-payment/", VerifyPaymentView.as_view(), name="verify-payment"),
+    path(
+        "payment/<str:pk>/delete/",
+        DeletePaymentView.as_view(),
+        name="delete-payment",
+    ),
+    path(
+        "payment/<str:pk>/verify/", VerifyPaymentView.as_view(), name="verify-payment"
+    ),
 ]

billing/views.py

@@ -92,21 +92,22 @@ class UpdatePaymentAPIView(StaffEditorPermissionMixin, generics.UpdateAPIView):
         serializer = self.get_serializer(instance, data=request.data, partial=False)
         serializer.is_valid(raise_exception=True)
         self.perform_update(serializer)
-        devices.update(is_active=True, expiry_date=device_expire_date)
+        devices.update(
+            is_active=True, expiry_date=device_expire_date, has_a_pending_payment=False
+        )
         return Response(serializer.data)
 
 
 class VerifyPaymentView(StaffEditorPermissionMixin, generics.UpdateAPIView):
     serializer_class = PaymentSerializer
     queryset = Payment.objects.all()
+    lookup_field = "pk"
 
     def update(self, request, *args, **kwargs):
         data = request.data
         user = request.user
-        print(user)
         method = data.get("method")
-        payment_id = data.get("payment_id")
+        payment_id = kwargs.get("pk")
-        abs_amount = data.get("abs_amount")
         if not method:
             return Response(
                 {"message": "method is required. 'WALLET' or 'TRANSFER'"},
@@ -117,11 +118,6 @@ class VerifyPaymentView(StaffEditorPermissionMixin, generics.UpdateAPIView):
                 {"message": "payment_id is required."},
                 status=status.HTTP_400_BAD_REQUEST,
             )
-        if not abs_amount:
-            return Response(
-                {"message": "abs_amount is required."},
-                status=status.HTTP_400_BAD_REQUEST,
-            )
 
         try:
             payment = Payment.objects.get(id=payment_id)
@@ -182,3 +178,26 @@ class VerifyPaymentView(StaffEditorPermissionMixin, generics.UpdateAPIView):
         print(response.json())
         if not response.json().get("success"):
             raise Exception("Payment verification failed.")
+
+
+class DeletePaymentView(StaffEditorPermissionMixin, generics.DestroyAPIView):
+    queryset = Payment.objects.all()
+    serializer_class = PaymentSerializer
+    lookup_field = "pk"
+
+    def delete(self, request, *args, **kwargs):
+        instance = self.get_object()
+        user = request.user
+        if instance.user != user and not user.is_superuser:
+            return Response(
+                {"message": "You are not authorized to delete this payment."},
+                status=status.HTTP_403_FORBIDDEN,
+            )
+        if instance.paid:
+            return Response(
+                {"message": "Paid payments cannot be deleted."},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+        devices = instance.devices.all()
+        devices.update(is_active=False, expiry_date=None, has_a_pending_payment=False)
+        return super().delete(request, *args, **kwargs)

devices/serializers.py

@@ -1,6 +1,7 @@
 from rest_framework import serializers
 from .models import Device
 from api.serializers import CustomReadOnlyUserSerializer
+from billing.models import Payment  # Import the Payment model
 
 
 class CreateDeviceSerializer(serializers.ModelSerializer):
@@ -32,10 +33,21 @@ class BlockDeviceSerializer(serializers.ModelSerializer):
 
 
 class DeviceSerializer(serializers.ModelSerializer):
+    pending_payment_id = serializers.SerializerMethodField()
+
     class Meta:
         model = Device
         fields = "__all__"
 
+    def get_pending_payment_id(self, obj):
+        # Query the last unpaid payment for the device
+        unpaid_payment = (
+            Payment.objects.filter(devices=obj, paid=False)
+            .order_by("-created_at")
+            .first()
+        )
+        return unpaid_payment.id if unpaid_payment else None
+
 
 class ReadOnlyDeviceSerializer(serializers.ModelSerializer):
     user = CustomReadOnlyUserSerializer(read_only=True)