Pinecast featured a Headliner integration from 2019 until November 2020, but the integration has since been sunset. You can continue to use Headliner directly at https://headliner.app.
From any episode dashboard, you can click the "Create an audiogram" link on the Overview tab to create an audiogram from your podcast episode. This will import your episode to Headliner. Billing for the creation of the audiogram is handled by Headliner.