```ruby
GDS::SSO.config do |config|
  config.user_model   = "User"
  config.oauth_id     = ENV['OAUTH_ID'] || "abcdefghjasndjkasndwhitehall"
  config.oauth_secret = ENV['OAUTH_SECRET'] || "secret"
  config.oauth_root_url = Plek.find("signon")
end
```

Use external URLs for Signon
user
```ruby
GDS::SSO.config do |config|
  config.user_model   = "User"
  config.oauth_id     = ENV['OAUTH_ID'] || "abcdefghjasndjkasndwhitehall"
  config.oauth_secret = ENV['OAUTH_SECRET'] || "secret"
  config.oauth_root_url = Plek.new.external_url_for("signon")
end
```
assistant