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In the next screen, grant the Project > Editor role to the service account:
The third step (Grant users access to this service account) is optional and can be skipped. Click on Done to create the service account.
Once the service account is created, you will need to generate a key. Select the service account, click on Add Key > Create New Key, select JSON as the Key type, and save the file.
In CSML Studio, under Channels > Connect a new channel, select the Google Chat channel. In the next screen, give your channel a name, a description and upload your service account credentials.
In the next screen, you can configure the bot's Welcome Flow, and copy the Chatbot Endpoint URL, which we will use in the next step.
To finalize the configuration, visit https://console.developers.google.com/apis/api/chat.googleapis.com/hangouts-chat (make sure that the selected project is still the same one as before) and fill the information as requested.
You can select Bot works in direct messages or Bot works in rooms... depending on the experience you want to give to users.
Under Bot URL, paste the Chatbot Endpoint URL from the previous step.
Click Save, and you are all set!
To find your bot in Google Chat, users have to navigate to the Bot catalog, which can be reached either by clicking the + icon next to the bot section of the left sidebar, or by searching for the name of the bot directly:
Upon activating the bot for the first time, the Welcome Message will be displayed: