Link "Buy" or "Preorder" buttons to your eCommerce site or enable in-app purchases via Apple/Android pay, Paypal, or stored credit cards.
Make it easy for your customers to support their local bookstore by ensuring that the buying experience is just as easy as other online retailers.
"Buying a book online should be just as easy as it is in my store. Customers want one-click digital payment options. Now I can deliver."