Digital commerce software and managed services provider Valista announced its Operator Payment Service will enable off-deck premium content transactions for U.S. Cellular. According to Valista, the service connects U.S. Cellular with both external aggregators and content providers, promising the carrier's subscribers will enjoy expanded access to mobile content and active participation in interactive services like text voting. The Operator Payments Service will also provide support for post-purchase operations like refunds and credits, allowing for end-to-end visibility of transactions and increasing the percentage of successful purchases while reducing service costs via authentication and authorization, subscription license and refund management and automated contract mediation.