A short intro about settings: https://mautic.com/help/new-hubspot-integration/

Hubspot's design is updated, the API key is to be found here.

The api key goes in here:

The data flow can be bi-directonal according to the settings:

The fields have to be mapped in the Contact Mapping and Company Mapping tabs. The mapping direction can be also decided here.

It makes sence to create a mapping strategy in advance. I assessed all the fields in both systems, which is attached to this guide.

Contacts from Friendly to Hubspot are pushed by campaigns:

This push is a simple integration action, that is part of the campaign action trigger. No need for separate cron job.