New seat/unit count (zero or more, whole number, for a per-unit service; at least 1 for a bundle service). On a per-unit service the change is scheduled as a dated revision effective at the next unbilled period boundary; already-invoiced periods keep their price.
≥ 0
custom_ratenumber
≥ 0
type_configobject
For a per-unit Fixed service, base_rate is the new unit rate (scheduled like a quantity change). pricing_basis may be sent only if it equals the stored basis; it cannot be changed after the service is added.