old_contents: from django.views import generic
  from django.http.response import HttpResponse
  # Create your views here.
  
  class BotairView(generic.View):
      def get(self, request, *args, **kwargs):
          return HttpResponse("Hello World!")
new_contents: from django.views import generic
  from django.http.response import HttpResponse
  # Create your views here.
  
  class BotairView(generic.View):
      def get(self, request, *args, **kwargs):
          if self.request.GET['hub.verify_token'] == 'EAAJPGyHraTUBAIiXMqZCZBtmZACxAmxQ9YZB9BZBCQao67vZADEfd2QMHiZBQDIHX621SFbEGRyIpdTxQIaiZBNskRiWg2r9mBap5jfjA6aOypHL4cHSe01vddzzEe8TFimUzGSF2WpCUWvlEgkItA5lFPan0iLozsMcH7pyokLaZCwZDZD':
              return HttpResponse(self.request.GET['hub.challenge'])
          else:
              return HttpResponse('Error, invalid token')
  
subject: verify token ayarlandı