In some examples, a service computing device receives an indication that a buyer associated with a buyer profile has selected a first item to purchase from a first merchant site. The service computing device associates information related to the first item with a persistent virtual cart associated with the buyer profile. The service computing device receives an indication that the buyer has selected a second item to purchase from the second merchant site. The service computing device associates information related to the second item with the buyer profile. The service computing device receives, from a buyer device, an indication of intention to purchase the items in the persistent virtual cart. Consequently, the service computing device may send an order for the first item to a computing device associated with the first merchant and an order for the second item to a computing device associated with the second merchant.