tinggal buat routes untuk callbacknya

omniauth.rb

# gem "omniauth"
# gem "omniauth-instagram"
# gem "instagram"

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :instagram, ENV['INSTAGRAM_KEY'], ENV['INSTAGRAM_KEY']
end

Instagram.configure do |config|
  config.client_id = ENV['INSTAGRAM_KEY']
  config.client_secret = ENV['INSTAGRAM_SECRET']
end