Document redirect URI

README.md

@@ -39,6 +39,12 @@ The generic OAuth2 client is configured with
 * optional parameters for scope
 * optional query parameters for the authorization url
 
+## Redirect URI
+
+Almost all OAuth2/OIDC providers will require you to register a redirect URI. Use a url of the form below, and set hostname, SSP_PATH and optionally port to the correct values.
+
+    https://hostname/SSP_PATH/module.php/authoauth2/linkback.php
+
 ## Provider specifc Tips
 
  * [Google](/docs/GOOGLE.md)

docs/GOOGLE.md

@@ -76,4 +76,7 @@ Google provides [documentation](https://developers.google.com/identity/protocols
 
 The section in the documentation about accessing the service, authentication and server flows are performed by this module.
 
+You will need to add the correct redirect URI to your OAuth2 client in the Google console. Use a url of the form below, and set hostname, SSP_PATH and optionally port to the correct values.
+
+    https://hostname/SSP_PATH/module.php/authoauth2/linkback.php