Say you make a purchase of $24.46, PWI Swipe rounds that up to the nearest dollar, $25. Then donates the difference between the nearest dollar and your purchase. So in this example, you would be donating $0.54 to your selected nonprofit.
PWI Swipe keeps a running total of the change from your transactions and at the end of the month. Then withdraws that sum from your funding account as an automatic transfer. The transfer will be completed at the very beginning of the next month after all card transactions have been processed.