custom_create.py

from interface import utils as iutils
from rest_framework import status

class PartnerViewSet(viewsets.ModelViewSet):
    authentication_classes = (ValidatorOauthAuthentication, )
    queryset = im.Partner.objects.all()
    serializer_class = PartnerSerializer

    def create(self, request, *args, **kwargs):
        partner_id, login, password = iutils.create_partner(
            request.data['BillingId'], request.data['ContactEmail'],
            request.data.get('Login', None), request.data.get('Password', None)
        )

        new_partner =im.Partner.objects.get(id=partner_id)
        serializer = self.get_serializer(new_partner)
        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)