ReactPHP needs improving, any ideas?

gistfile1.txt

<?php

namespace App\ProcessManager\Billing;

use App\Read\Billing\Queries\GetDefaultPlan;
use App\Read\Identity\Queries\UserWithId;
use App\Read\Identity\UserDto;
use App\Services\Bus\BillingCommandBus;
use App\Services\Bus\BillingQueryBus;
use App\Services\Bus\IdentityQueryBus;
use ProjectName\Billing\Model\Command\OpenAccountForUser;
use ProjectName\Identity\Models\Events\UserRegistered;
use Rhumsaa\Uuid\Uuid;
use React\Promise;

final class SetupBillingAccountForRegisteredUser
{
    /** @var BillingCommandBus */
    private $billingCommandBus;

    /** @var BillingQueryBus */
    private $billingQueryBus;

    /** @var IdentityQueryBus */
    private $identityQueryBus;

    /**
     * @param BillingCommandBus $billingCommandBus
     * @param BillingQueryBus $billingQueryBus
     * @param IdentityQueryBus $identityQueryBus
     */
    public function __construct(BillingCommandBus $billingCommandBus,
                                BillingQueryBus $billingQueryBus,
                                IdentityQueryBus $identityQueryBus)
    {
        $this->billingCommandBus = $billingCommandBus;
        $this->billingQueryBus = $billingQueryBus;
        $this->identityQueryBus = $identityQueryBus;
    }

    /**
     * @param UserRegistered $event
     */
    public function __invoke(UserRegistered $event)
    {
        $defaultPlan = $this
            ->billingQueryBus
            ->dispatch(new GetDefaultPlan);

        $aUser = $this
            ->identityQueryBus
            ->dispatch(UserWithId::fromString($event->userId()));

        Promise\all(['defaultPlan' => $defaultPlan, 'aUser' => $aUser])    
            ->done(function (array $result) {
                $this->openAccountForUser(
                    $result['defaultPlan'], 
                    $result['aUser']
                );
            });
    }

    private function openAccountForUser(PlanDto $plan, UserDto $aUser)
    {
        $command = OpenAccountForUser::withData(
            Uuid::uuid4()->toString(),
            $aUser->getUserId(),
            $aUser->getName(),
            $aUser->getEmail(),
            $aUser->getAddress(),
            $plan->getPlanId()
        );

        $this->billingCommandBus->dispatch($command);
    }
}