I managed to get the countdown timer to trigger the push notification, when it finishes the counter, all right.
But I ran into a problem, if you can help me I will be very grateful.
The countdown timer only triggers the push notification, when the application is open, when not, it does not send. In this case, if I open the application 10 minutes after the accountant has finished, only then will he send the notification.
He sends notification at the right time, only if I have the app ready, waiting for the countdown to end.
Detailing about the app.
There are two applications.
Application A has the counter, and when it finishes, it sends the push notification to application B, to its proper user.