You can pull a list in HubSpot based off the contact property "Last Order Date" is known and then add a second filter, to only show those whose contact property "Total Order Value" is equal to zero.

Unific syncs all orders whether they are $0 are if a price is associated.  If you have a specific scenario where you are giving away sample products and you don’t want them to be considered as part of your order count, you would have to schedule a call with a member of our services team to get a custom quote. To schedule a call, click the link here: https://www.unific.com/meetings/unific/introductory-call-and-demo

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