external_idstring<SubscriptionExternalId>Requiredbilling_timeenum<BillingTime>Optionalplan_overridesobject<PlanOverridesRequest>Optionalamountobject<Amount>Optionalcurrency_codestring<Currency>Requiredchargesobject<SubscriptionUsageBasedCharge>[]Optionalmin_amountobject<AmountNoCurrency>Optionalminimum_commitmentobject<MinimumCommitmentRequest>Optionalamountobject<AmountNoCurrency>RequiredchargeUsageobject<ChargeUsageThresholdRequest>[]Optional