回复：- 问个去加拿大(第三国)的美国领事馆签入美签证的问题

Yes, you need to have an id to get into the site to view available date for visa appointment. But they won't charge you until you book it. Yes, the phone number is 900 number, you have to pay. But everything you need is online, it is useless to call them. As long as you have employment verification letter, your most recent pay stub, I797, you'll be fine. The only risk you may have is background checking which may take 2-3 weeks. But not everyone encounters backchecking.