Returns a paginated list of subscriptions matching the provided filter criteria. Supports filtering by AccountId (required), CustomerIds, SerialNumbers (exact match), Vins (partial match), ContractEndDateFrom/To, SubscriptionName, and Status. Response includes BillingEndDate, AutoRenewalTerm, PromotionalCreditTotal, and DeviceInfo for each subscription. ETF fields (EtfPerUnit, EtfTotal) are retained for API consumers.