def create_signup_location
  glist    = Gibbon::API.new.lists
  list_ids = glist.list(filters: { list_name: 'register' })['data'].map {|m| m['id'] }

  list_ids.each do |list_id|
    payload = {
      id: list_id,
      tag: 'SIGNUP_LOC',
      name: 'Signup Location',
      options: {
          field_type: 'dropdown',
          req: false,
          public: true,
          show: true,
          choices: ['App', 'WebApp']
      }
    }

    begin
      glist.merge_var_add(payload)
    rescue Gibbon::MailChimpError => ex
      puts ex.message
    end
  end
end