Optionaltax_Only required if a default tax behavior was not provided in the Stripe Tax settings. Specifies whether the price is considered inclusive of taxes or exclusive of taxes. One of inclusive, exclusive, or unspecified. Once specified as either inclusive or exclusive, it cannot be changed.
Optionalunit_A positive integer in cents (or local equivalent) (or 0 for a free price) representing how much to charge or a negative integer representing the amount to credit to the customer.
Optionalunit_Same as unit_amount, but accepts a decimal value in cents (or local equivalent) with at most 12 decimal places. Only one of unit_amount and unit_amount_decimal can be set.
Three-letter ISO currency code, in lowercase. Must be a supported currency.