How to send a notification from Camunda to front-end app

Hello i have a process wich generate a credit request from client , After the bank agent approve the request i want to send a confirmation request to the client wich means a notification containing a question like ( Are you sure to proceed your request ? Yes or No ) if the client says yes the credit will be send to his account . So which type of tasks i should use to send the notification to the Android app and how ?
This is the model
Credit.bpmn (7.1 KB)

Probably best to use a Send Task for something automated like that.