Example PaymentContext for creating a payment object.

PaymentContext.php

<?php

class PaymentContext
{
    /**
     * @var PaymentId
     */
    public $paymentId;

    /**
     * @var Money
     */
    public $amount;
    
    public function create(Factory $factory) : Payment
    {
        return new Payment(
            $this->paymentId ?? PaymentId::create(), // random id
            $this->amount ?? new Money(\random_int(10, 9999), new Currency('EUR'));
        );   
    }    
}