A mobile device with a display, processor(s), and memory: identifies a retail machine configured for wireless communications based on broadcasted information transmitted by the retail machine and including an identifier corresponding to the retail machine; transmits the identifier to a server and receives from the server an electronic communication including a promotional offer for products or services offered by the retail machine; displays the promotional offer; detects selection of a promotional offer; receives a notification from the retail machine that a product or service was provided by the retail machine for a user of the mobile device; transmits confirmation information associated with the notification to the server, receives promotion validation information from the server indicating validation of the promotional offer; and based on the promotion validation information, displays information confirming application of the promotional offer.