getDefaultPaymentMethod example

$countries = $this->connection->fetchFirstColumn('SELECT id FROM country WHERE active = 1');
        $salesChannelIds = $this->connection->fetchFirstColumn('SELECT LOWER(HEX(id)) FROM sales_channel');

        $customer = [
            'id' => $id,
            'customerNumber' => '1337',
            'salutationId' => $salutationId,
            'firstName' => 'Max',
            'lastName' => 'Mustermann',
            'email' => 'test@example.com',
            'password' => 'shopware',
            'defaultPaymentMethodId' => $this->getDefaultPaymentMethod(),
            'groupId' => TestDefaults::FALLBACK_CUSTOMER_GROUP,
            'salesChannelId' => $salesChannelIds[array_rand($salesChannelIds)],
            'defaultBillingAddressId' => $billingAddressId,
            'defaultShippingAddressId' => $shippingAddressId,
            'addresses' => [
                [
                    'id' => $shippingAddressId,
                    'customerId' => $id,
                    'countryId' => Uuid::fromBytesToHex($countries[array_rand($countries)]),
                    'salutationId' => $salutationId,
                    'firstName' => 'Max',
                    

public function getGroups(): CustomerGroupCollection
    {
        return new CustomerGroupCollection(
            $this->fmap(fn (CustomerEntity $customer) => $customer->getGroup())
        );
    }

    public function getDefaultPaymentMethods(): PaymentMethodCollection
    {
        return new PaymentMethodCollection(
            $this->fmap(fn (CustomerEntity $customer) => $customer->getDefaultPaymentMethod())
        );
    }

    public function getSalesChannels(): SalesChannelCollection
    {
        return new SalesChannelCollection(
            $this->fmap(fn (CustomerEntity $customer) => $customer->getSalesChannel())
        );
    }

    public function getLastPaymentMethods(): PaymentMethodCollection
    {

if (!empty($payment)) {
            return $payment;
        }

        if (empty($paymentMethods)) {
            unset($this->session['sPaymentID']);

            return false;
        }

        $payment = $this->getDefaultPaymentMethod($paymentMethods);

        $this->session['sPaymentID'] = (int) $payment['id'];
        $this->front->ensureRequest()->setPost('sPayment', (int) $payment['id']);
        $this->admin->sUpdatePayment();

        // if customer logged in and payment switched to fallback, display cart notice. Otherwise anonymous customers will see the message too         if (Shopware()->Session()->get('sUserId')) {
            $this->flagPaymentBlocked();
        }

        return $payment;
    }