You can find the customer details via Orders -> Advanced Search. Fill in one (or more) of the fields and click Search. Scroll down to find the order(s). If you click on the order line, you'll be redirected to a screen with order details including information about the customer.
Log in to the back office and select Reports -> Payment Cluster Details. Enter one of the 3 IDs and click Search. The payment details will be shown on your screen. You can find information about the customer by clicking on the payment method. A pop-up window with customer details will appear.