prepareAffiliateTracking example

if ($context->getCustomer()) {
            return $this->redirectToRoute('frontend.account.home.page');
        }

        try {
            if (!$data->has('differentShippingAddress')) {
                $data->remove('shippingAddress');
            }

            $data->set('storefrontUrl', $this->getConfirmUrl($context, $request));

            $data = $this->prepareAffiliateTracking($data, $request->getSession());

            if ($data->getBoolean('createCustomerAccount')) {
                $data->set('guest', false);
            } else {
                $data->set('guest', true);
            }

            $this->registerRoute->register(
                $data->toRequestDataBag(),
                $context,
                false,