To minimize transaction fees, you may select a payment threshold by clicking the link in the Payment Info tab. The payment threshold is the minimum amount set to have your payment processed. If a payment threshold is set, payments will not be processed until that amount has been met. Your payments due should be monitored from time to time to ensure that you don't allow payments to expire due to a payment threshold being set too high.
For more information, please review the Researcher Manual available in your Dashboard.