Fixed-fee prices on a plan can now each be configured as billed in advance or in arrears, independent of the other fixed fees. This lets you combine, for example, an upfront platform fee billed in advance with an in arrears flat fee that draws from a prepaid credit balance — on the same plan.

In the dashboard, you'll find a per-price Billing mode picker on each fixed-fee card. Plans created via the API can now include fixed-fee prices with differing billed_in_advance values.