client = Armory::REST::Client.new do |config|
  config.api_key = "<api key from https://dev.battle.net/>"
  config.cache = Moneta.new   # Optional
  config.logging = Logger.new # Optional
end

character = client.character('realm_name', 'character_name',
                  region: "US",
                  fields: "progression,talents,items,achievements,pvp,pets,mounts")

puts character.items.head.name

guild = client.guild('realm_name', 'guild_name')
                      region: "US",
                      fields: 'members')
puts guild.members.count