/**
* @param PaymentId $paymentId
*
* @return Payment
* @throws PaymentNotFoundException
*/
public function getById(PaymentId $paymentId) : Payment
{
if (!array_key_exists((string) $paymentId, $this->payments)) {
throw PaymentNotFoundException::byId($paymentId);
}
return $this->payments[(string) $paymentId];
}