You can opt-out of our push notifications in your phone's settings, rather than in the app directly. The way to do this will depend on your device itself, however the most common devices will use the following paths:
iPhone
Settings > scroll down to the app list > Chip > Slide the "allow notifications" toggle to off.
Google Pixel
Settings > Apps > Chip > Notifications > Toggle all or just your desired notification to Off.
Samsung
Settings > Notifications > Tap "see all" where your app list appears > Change the drop-down to "All" > Find Chip and toggle notifications to off.