A notification service and correspondingly configured wireless device for providing asynchronous communications over a communication network for an application of the wireless device in communication with a selected service. The selected service has a source schema definition including an output notification definition associated with a correlation ID. The notification service comprises a reverse schema definition of the source schema definition such that the reverse schema definition includes an input notification operation definition corresponding to the output notification definition. The input definition is associated with the correlation ID and a parameter list of the output definition. The output definition is for defining an output message of the selected source that corresponds to an input message of the notification service defined by the input definition. The notification service has a first communication port adapted for receiving the output message of the selected service as the input message to the notification service, wherein the messages are adapted to include the correlation ID for identifying the network address of the wireless device. The information contents of the output message of the selected source are transmitted as an asynchronous communication to the application of the wireless device identified by the correlation ID.