billingScheme property
Describes how to compute the price per period. Either per_unit or tiered. per_unit indicates that the fixed amount (specified in unit_amount or unit_amount_decimal) will be charged per unit in quantity (for prices with usage_type=licensed), or per unit of total usage (for prices with usage_type=metered). tiered indicates that the unit pricing will be computed using a tiering strategy as defined using the tiers and tiers_mode attributes.
Implementation
PriceBillingScheme? billingScheme;