Kanji Furuhashi

@kharanenka Thanks. Regarding 2, it's OK, then. I just didn't know the purpose of `external_id`.

@kharanenka Thanks for your response. On second thought, I decided not to send pull request adding feature to save selected shipping type. Now I feel like `Cart::onSetShippingType` is intentionally not...

I'm really glad to hear you are interested in my sample code! You can do whatever you want with it, no requirement ;) For example, you can modify and redistribute...