Here are the Limitations of New Hubspot Integration (quote to cash workflow).

• Due to the limitations of the Hubspot CRM platform, we currently support only flat-fee & per-unit-based pricing models. Merchants who use any other pricing model other than these two can still use this integration using the iFrame approach.
• Hubspot does not support ‘coupons’ in its product line items. Hence for the customers who use the coupons while quoting a deal or creating a subscription will be limited to use the iFrame approach instead.
• Since Hubspot does not have a subscription object available (for now), all the subscription information is shown as a CRM card on the deals page. While this is helpful in showing to a user all the required information regarding a subscription, this information cannot be further used for any kind of data reporting or analysis automatically.