code: def get_enterprise_customer_user_queryset(self, request, search_keyword, customer_uuid, page_size=PAGE_SIZE):
          
          page = request.GET.get('page', 1)
          learners = EnterpriseCustomerUser.objects.filter(enterprise_customer__uuid=customer_uuid)
          user_ids = learners.values_list('user_id', flat=True)
          matching_users = User.objects.filter(pk__in=user_ids)
          if search_keyword is not None:
              matching_users = matching_users.filter(
                  Q(email__icontains=search_keyword) | Q(username__icontains=search_keyword)
              )
          matching_user_ids = matching_users.values_list('pk', flat=True)
          learners = learners.filter(user_id__in=matching_user_ids)
          return paginated_list(learners, page, page_size)
docs: Get the list of EnterpriseCustomerUsers we want to render.
  
          Arguments:
              request (HttpRequest): HTTP Request instance.
              search_keyword (str): The keyword to search for in users' email addresses and usernames.
              customer_uuid (str): A unique identifier to filter down to only users linked to a
              particular EnterpriseCustomer.
              page_size (int): Number of learners displayed in each paginated set.