Do I need to manually adjust actual income before chargebacks on platforms like Faire, Shopcanal, Amazon, etc?

No, there's no need for manual adjustment. If you assign line items on your invoice as "Sales of product income" when creating invoices, we book the invoiced amount as such. For Amazon, we can help adjust your platform fee quarterly. As for Faire, we typically consider it as cash sales and suggest you create a vendor rule to map all Faire inflow to "Sales of product income".