First, head over to https://app.datatrics.com/integrations/commercetools. Click on the "Install" button, and you will be redirected to the settings screen:
​

Press the 'Install' button and you'll get an overview of the required fields you need to fill in. These comprise the Client ID and Client Secret.
​
You can obtain the Client ID and Client Secret when you create a new Client API.
​
The Client ID and a unique ID of the API client. This contains the same value as the OAuth 2.0 client_id. The secret is only shown once in the response to creating the API Client. This is the OAuth 2.0 client_secret
​
After filling in these fields, the integration has been successfully made.