assembleReturnUrl example

null,
                null,
                $transaction->getPaymentMethodId(),
                $transaction->getId(),
                $finishUrl,
                $paymentFinalizeTransactionTime,
                $errorUrl
            );

            $token = $this->tokenFactory->generateToken($tokenStruct);

            $returnUrl = $this->assembleReturnUrl($token);
            $paymentTransaction = $this->paymentTransactionStructFactory->async($transaction, $order, $returnUrl);

            return $paymentHandler->pay($paymentTransaction, $dataBag, $salesChannelContext);
        }

        return null;
    }

    private function assembleReturnUrl(string $token): string
    {
        $parameter = ['_sw_payment_token' => $token];