If you would like to stop the app from sending you notifications please do the following:
Step #1: Go on ‘Settings’ app on your iPhone or iPad
Step #2: Choose the option of ‘Notification’
Step #3: Find and select the app for what you want to modify the push notifications behavior from. This will be available on Notifications Settings’ list.
Step #4: There you see the option of ‘Allow Notifications’ – your happiness lies there!
Step #5: Flip it to ‘OFF’. This will result in toggling the option to ‘OFF’ position with button grayed.
Step #6: Repeat the procedure for all applications where you want such setting to be done
Hope this was helpful!