# Chat21 channel configuration

Tiledesk uses [Chat21](http://www.chat21.org) as messaging platform. Refer to [Architecture overview](https://developer.tiledesk.com/architecture/schema) to undestand the product's modules. In detail the tiledesk-server component uses Chat21 channel for sending chat messages, creating groups, etc.

So in order to correctly configure your Tiledesk installation you MUST configure the following properties:

* FIREBASE\_PRIVATE\_KEY. You can get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-an-sdk-firebase-admin-account). It is in the form: `-----BEGIN PRIVATE KEY-----\ABCD78261TGV...HGAGBA82727\n-----END PRIVATE KEY-----\n`. More info about firebase private key [here](https://firebase.google.com/docs/admin/setup#initialize_the_sdk).
* FIREBASE\_CLIENT\_EMAIL. You can get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-an-sdk-firebase-admin-account). It is in the form: `firebase-adminsdk-******@************.iam.gserviceaccount.com`
* FIREBASE\_PROJECT\_ID. Get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-an-app).
* FIREBASE\_APIKEY. Get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-an-app).
* FIREBASE\_AUTHDOMAIN. Get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-an-app). It is in the form: `CHANGEIT.firebaseapp.com`
* FIREBASE\_DATABASEURL. Get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-an-app). It is in the form: `https://CHANGEIT.firebaseio.com`
* FIREBASE\_STORAGEBUCKET. You can find it [here](https://github.com/Tiledesk/tiledesk-docs/tree/7ed1cde88582e9a174199b20bd6ad610f0153fcb/configuration/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-a-storage). It is in the form: `CHANGEIT.appspot.com`
* FIREBASE\_MESSAGINGSENDERID. Get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-an-app). A unique numerical value created when you create your Firebase project, available in the [Cloud Messaging](https://console.firebase.google.com/project/_/settings/cloudmessaging/) tab of the Firebase console **Settings** pane.
* CHAT21\_ENABLED. Enable Chat21 channel with **true** value.
* FIREBASE\_APP\_ID. Get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#create-an-app).
* CHAT21\_URL. Get it [here](https://github.com/Tiledesk/tiledesk-docs/blob/master/installation/chat21-installation/chat21-firebase-installation/create-a-firebase-project.md#get-the-cloud-function-url). It is in the form: `https://mytiledeskinstallation87.cloudfunctions.net`
* CHAT21\_ENGINE. Enter the default value **firebase**
* CHAT21\_APPID. Enter the default value **tilechat**
* CHAT21\_ADMIN\_TOKEN. The Chat21 admin token. The default value is `chat21-secret-orgAa,`. See [here](https://github.com/chat21/chat21-cloud-functions/blob/master/docs/setup_options.md#admin-token) to change it.

You can find other information regarding the env variable here: <https://github.com/Tiledesk/tiledesk-server/blob/master/.env.sample>