As long as you have routes set up to handle the incoming notifications then you should be all good 
Also, for resubscribing rather than waiting for expiration I’d advise resubscribing at some point before expiration, as that will overwrite any existing subscription that matches it (so you wont have to worry about duplicate subscriptions), and if there’s any issues around the time of resubscription you’ll still have time to retry before your old ones expires.