TransferMoney.php

<?php
declare(strict_types=1);

namespace Acme\Account\UseCases;

use Acme\Account\Models\Account;
use Acme\Account\Models\AccountNumber;
use Acme\Account\Models\Money;

final class TransferMoney
{
    /** @var TransferMoneyQueryPort */
    private $query;
    /** @var TransferMoneyStorePort */
    private $store;

    public function __construct(TransferMoneyQueryPort $query, TransferMoneyStorePort $store)
    {
        $this->query = $query;
        $this->store = $store;
    }

    public function execute(
        AccountNumber $sourceNumber,
        AccountNumber $destinationNumber,
        Money $money
    ) {
        $source = $this->query->source($sourceNumber);
        $destination = $this->query->destination($destinationNumber);

        $source->withdraw($money);
        $destination->deposit($money);

        $this->store->store($source, $destination);
    }
}

interface TransferMoneyQueryPort
{
    public function source(AccountNumber $accountNumber): Account;

    public function destination(AccountNumber $accountNumber): Account;
}

interface TransferMoneyStorePort
{
    public function store(Account $source, Account $destination);
}