Any US Citizen have recent experience using Pakistan's online visa system?

USA Citizen. I've applied for an individual tourist visa using Pakistan's online system and supplied the requested documents: Photo, Passport Page and a copy of my hotel booking. I got a reply asking for additional documents: 1. Invitation letter from Pakistan. 2. Pk ID or Passport copy of the Invitee. I thought the hotel booking covered the invitation letter and wouldn't I be the invitee?