How is sales tax calculated on payments?
Give each line item a Stripe tax code — like txcd_10000000 for digital goods or txcd_99999999 for general goods — and include the customer's address; Forte computes the tax and returns subtotal, tax, and total. Tax is always exclusive (added on top of the unit price), and omitting the address skips tax entirely.
Use txcd_92010001 for shipping lines so regions that tax shipping differently are handled correctly.