File this under knowing your customer, Walmart has introduced a ‘Pay with cash’ option when shopping online at walmart.com. According to Walmart, only 15% of transactions at stores use credit, cash is king. With the new system, you place an order online, select the cash payment option, and then you have 48-hours to go to a local store and pay for the item. Once the transaction is complete, the item is shipped. In addition to a new payment option, it also opens up thousands of new products to buy not offered in store.