Added space ID section

Author: MStephen024

src/unify/unify-settings.md

@@ -17,3 +17,7 @@ Sources provide the data that Unify uses to perform Identity Resolution. You can
 | [Server](/docs/connections/sources/#server)                      | ![Supported.](/docs/images/supported.svg)   |
 | [Object Cloud ](/docs/connections/sources/#object-cloud-sources) | ![Not supported.](/docs/images/unsupported.svg) |
 | [Event Cloud](/docs/connections/sources/#event-cloud-sources)    | ![Supported.](/docs/images/supported.svg)   |
+
+## API access
+
+The API access tab is where you can find the space ID value of the Engage space, and also generate an access token to connect to the [Profile API](https://segment.com/docs/unify/profile-api/). Each Engage space created in your workspace will have its own unique space ID value.