Some embodiments provide a non-transitory machine-readable medium that stores a program. The program receives, from an application, a request to schedule a notification. The program further generates a pending notification. The program also stores the pending notification in a queue. The program further periodically iterates through the queue to check whether an expiration time of the pending notification has elapsed. Upon determining that the expiration time of the pending notification has elapsed, the program also deletes the pending notification from the queue without processing the pending notification. Upon receiving from the application a second set of interactions performed on the application that matches the defined set of interactions specified in the pending notification, the program further processes the pending notification by sending the recipient specified in the pending notification a notification comprising the message specified in the pending notification.