1. The Aggregator server will send a notification to the top (say three) drivers simultaneously, whichever driver accepts the request first will be assigned the ride. The other drivers will receive a cancellation request. If none of the three drivers respond, the Aggregator will request a ride from the next three drivers from the list.
how does the aggregator server send a notification to the drivers? there is no connection from the aggregator server to the driver in the high level design diagram.