linkedin_api_v2.rb

class Linkedin
  include HTTParty
  base_uri 'https://api.linkedin.com/v2'

  def initialize(token)
    @token = token
  end

  def me
    self.class.get('/me', options)
  end

  private

  def options
    @options ||= { headers: { "Authorization": "Bearer #{@token}" } }
  end
end

l = Linkedin.new("my-token")
l.me["id"]