Various embodiments herein each include at least one of systems, methods, software, and data structures that track timeout periods with regard to data processing requests, dynamically tune timeout periods within payment transaction processing systems, directly and indirectly decrease unproductive consumption of transaction processing resources, avoid situations giving rise to duplicate payments for a single purchase, and decrease transaction processing timeouts. Some such embodiments include monitoring a timeout period within a payment transaction processing system to stop processing and return a timeout error when a transaction timeout period is about or has expired while also stopping processing of the transaction and rolling back any portions of processing of the payment request that may have already been performed.