code: def enterprise_customer_required(view):
      
      @wraps(view)
      def wrapper(request, *args, **kwargs):
          """
          Checks for an enterprise customer associated with the user, calls the view function
          if one exists, raises PermissionDenied if not.
          """
          user = request.user
          enterprise_customer = get_enterprise_customer_for_user(user)
          if enterprise_customer:
              args = args + (enterprise_customer,)
              return view(request, *args, **kwargs)
          else:
              raise PermissionDenied(
                  'User {username} is not associated with an EnterpriseCustomer.'.format(
                      username=user.username
                  )
              )
      return wrapper
docs: Ensure the user making the API request is associated with an EnterpriseCustomer.
  
      This decorator attempts to find an EnterpriseCustomer associated with the requesting
      user and passes that EnterpriseCustomer to the view as a parameter. It will return a
      PermissionDenied error if an EnterpriseCustomer cannot be found.
  
      Usage::
          @enterprise_customer_required()
          def my_view(request, enterprise_customer):
              # Some functionality ...
  
          OR
  
          class MyView(View):
              ...
              @method_decorator(enterprise_customer_required)
              def get(self, request, enterprise_customer):
                  # Some functionality ...