A method for sending notifications from a notification server to a mobile computing device to a user includes obtaining, at a processing device of the notification server, a request including user request information to notify the user when a product offered for sale by a retailer becomes available in a facility of the retailer when the mobile computing device scans a notification image. The user request information includes an item identifier corresponding to the product, facility information corresponding to the facility, and a user identifier corresponding to the user. When the product becomes available within the facility, the processing device retrieves the user request information from a user request database and generates a notification based on the user request information. The processing device transmits the generated notification to the mobile computing device.