Visitconsole.cloud.google.com and create or use an existing project, go toAPIs & Services ->Credentials and create there anOAuth ClientID for the application typeWebApplicaton. There you get the ClientID and the ClientSecret for your configuration. It's important, that you set in the Google Cloud PlatformYOUR_URL/api/v1/auth/google/callback as an authorized redirect URL.

Visitapps.dev.microsoft.com and register an application. To set the callback URL, you need to click on theAdd Platform button there you selectWeb and enter as itYOUR_URL/api/v1/auth/microsoft/callback. After that you can generate a password on theGenerate New Password button which represents yourClientSecret.

Visitgithub.com and create a new OAuth application. For the callback URL useYOUR_URL/api/v1/auth/github/callback. The other values are not relevant. There you get as expected the ClientID and the ClientSecret.

• ReplaceYOUR_URL with your origin URL. In the end the URL should look e.g. likehttp://shortener.google.com/....