| Auth Code | Code for obtaining an "Access Token". Auth Code is a "one-time password". |
| Access Token | Token that can be used to access a protected resource. |
| ACS | HIN's Access Control Service |
| Client_ID | OAuth Client ID: An ID assigned by HIN for the third-party application. This is required to request an Access Token with the Auth Code. |
| client_secret | Password defined by HIN for the third-party application. Must be provided along with Client_ID when obtaining an Access Token. |
| Token Group | A token group is a group of applications that are granted access to certain resources. |
| IDP | Identity Provider |
| Refresh Token | Token used to obtain a new Access Token without user interaction. |