In HubSpot, go to Development, then Legacy Apps.

Click Create legacy app and choose Private.
On the Scopes tab, add the permissions Retell needs.
Click Create app, then Show token to copy your access token.
In Retell, open Integrations, find HubSpot, and click Connect. Our HubSpot phone integration guide walks through the full setup, from the private app token to call logging.
Paste the token as your API Key, then click Connect.

Outbound follow-up → load the open deal → agent references the last conversation → after the call, advance the deal stage and log the call to the contact timeline
Retell is listed on the HubSpot marketplace, and calls can be triggered directly from HubSpot workflows — HubSpot marketplace docs













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