Self-Checkout for Lafayette College Library users. Lafayette Library Checkout is the easy way to self-checkout library items on campus from your phone or tablet. To enable the app once downloaded, scan or enter your library barcode (on the back on your Lafayette ID). In the checkout screen, use the + button to checkout library items. Touch the Finish button when done. Before you leave the library with your items, deactivate and scan your materials at the Deactivation Station.