In order to be able to use functionality within the Hubspot chrome extension, GetAccept needs to be granted access to the lists tool which is a part of the marketing module. This access does not require the Hubspot marketing hub, it is enough with the free marketing access.
Furthermore to be able to fetch product value parameters correlated to a deal (IE, products added to a deal), you need to have access to Ecommerce.
No timeline events show up
Check that you have enabled GetAccept in the filtered list of events inside HubSpot.