You can use a custom OAuth app to authenticate with a service account or a user account. See Using OAuth Authentication for more information.

Desktop Authentication with a Custom OAuth App

Get the OAuth Access Token

After setting the following, you are ready to connect:

• OAuthClientId: Set this to the client Id assigned when you registered your app. You can find it by visiting trello.com/app-key under API Key
• OAuthClientSecret: Set this to the client secret assigned when you registered your app. You can find it by visiting trello.com/app-key scrolling to the bottom
• CallbackURL: Set this to a localhost callback such as http://localhost:33333. If left empty, the CData ODBC Driver for Trello will default to http://localhost:33333.

When you connect the driver opens the OAuth endpoint in your default browser. Log in and grant permissions to the application.