feat(billing): WIP Add Topup model, filters, serializers, and views for topup management ✨

billing/serializers.py

@@ -1,19 +1,37 @@
 from rest_framework import serializers
-from .models import Payment
+from .models import Payment, Topup
 from devices.serializers import DeviceSerializer
+from api.serializers import CustomReadOnlyUserSerializer
 
 
 class PaymentSerializer(serializers.ModelSerializer):
     devices = DeviceSerializer(many=True, read_only=True)
 
-    class Meta:
+    class Meta:  # type: ignore
         model = Payment
         fields = "__all__"
 
 
 class UpdatePaymentSerializer(serializers.ModelSerializer):
-    class Meta:
+    class Meta:  # type: ignore
         model = Payment
         fields = [
             "number_of_months",
         ]
+
+
+class TopupSerializer(serializers.ModelSerializer):
+    user = CustomReadOnlyUserSerializer(read_only=True)
+
+    class Meta:  # type: ignore
+        model = Topup
+        fields = [
+            "id",
+            "amount",
+            "user",
+            "paid",
+            "mib_reference",
+            "created_at",
+            "updated_at",
+        ]
+        read_only_fields = ["id", "created_at", "updated_at"]