Process lipisha IPN - Initiate/Acknowledge

def lipisha_ipn(self):
        """Process lipisha IPN - Initiate/Acknowledge"""
        if not (self.request.POST.get('api_key') == LIPISHA_API_KEY and
                self.request.POST.get('api_signature') == LIPISHA_API_SIGNATURE):
            raise HTTPBadRequest
        return process_lipisha_payment(self.request)