First, navigate to the campaign where you'd like to connect the CallTrackingMetrics integration, then click "Integrations" from the menu on the left side of the screen.

Next, either search CallTrackingMetrics in the upper right search box, or click the Phone category, then click CallTrackingMetrics.

Then click Connect New Account.

In the next window that appears, enter the "access key" and the "secret key" for your customer's CallTrackingMetrics account that you would like to connect, then click "Save".

The integration will then be complete, and your client's CallTrackingMetrics.com metrics will then be imported and displayed within their campaign.