text: from django.http import HttpResponse
  from rest_framework.permissions import AllowAny
  from rest_framework.views import APIView
  
  from tinkoff.api.permissions import TinkoffCreditNetmaskPermission
  from tinkoff.api.serializers import CreditNotificationSerializer, PaymentNotificationSerializer
  
  
  class TinkoffPaymentNotificationsView(APIView):
      permission_classes = [AllowAny]  # validation is done later via supplied JSON
  
      def post(self, request, *args, **kwargs):
          serializer = PaymentNotificationSerializer(data=request.data)
          serializer.is_valid(raise_exception=True)
          serializer.save()
  
          return HttpResponse('OK')
  
  
  class TinkoffCreditNotificationsView(APIView):
      permission_classes = [TinkoffCreditNetmaskPermission]
  
      def post(self, request, *args, **kwargs):
          serializer = CreditNotificationSerializer(data=request.data)
          serializer.is_valid(raise_exception=True)
          serializer.save()
  
          return HttpResponse('OK')
  