I'm not receiving any push notifications

To receive push notifications, it is first of all important that you allow them on your phone. Depending on your phone, you can find this setting via:

iOS: Settings > Pay2Wash > Notifications
AndroidControl notifications on Android - Android Help (google.com)

In addition, it is important that you enbale push notifications in your Pay2Wash account. To do this, go to 'My account' > 'Notification settings' and select the option 'Notify me via push notifications'.