adding

apps/notifications/api/serializers.py

@@ -0,0 +1,21 @@
+from rest_framework import serializers
+
+
+class NotificationItemSerializer(serializers.Serializer):
+    id = serializers.IntegerField()
+    title = serializers.CharField()
+    body = serializers.CharField()
+    created_at = serializers.DateTimeField()
+    is_read = serializers.BooleanField()
+
+
+class TrialWarningSerializer(serializers.Serializer):
+    days_left = serializers.IntegerField()
+    title = serializers.CharField()
+    body = serializers.CharField()
+
+
+class NotificationListSerializer(serializers.Serializer):
+    unread_count = serializers.IntegerField()
+    trial_warning = TrialWarningSerializer(allow_null=True)
+    items = NotificationItemSerializer(many=True)