> You actually have to keep their account active and make it work somehow. If you can't... If you don't, not if can't. If you can demonstrate a reason that tha

> You actually have to keep their account active and make it work somehow. If you can't... If you don't, not if can't. If you can demonstrate a reason that that piece of information is absolutely necessary for your service then you can deny service if the person doesn't want to provide the data. Otherwise you could submit a complaint about any delivery service for refusing delivery if you refuse to give them your address. If you don't provide a reason why that data is necessary and still require the person to give it to you, then yes, you're in for some pain.