Step 1: Go to System -> Integrations Menu.

Step 2: Click add new integration to open a new integration form.

Step 3: Enter the integration name as the form in the above picture.
Step 4: Grant access to the API resources.

Step 5: Save to create a new consumer public & secret keys for integration.
Step 6: Activate integration for creating an access token for the external application.

After activating, we can see the integration detail in the picture below.
