E-commerce has grown from humble beginnings in 1971/1972 when two students used the ARPANET network to discreetly arrange the sale of cannabis. Consumers now scrutinize online purchases and any difficulty or irritation in the checkout process can lead to lost sales. To prevent abandoned checkout processes, retailers should display a progress bar, remove distractions, and use clear calls to action to guide customers through a single path to payment completion. Sunday nights are now the most popular time for online shopping.