Handling existing subscribers in app

OK this is my first app, and I have been through the forum but can’t find quite the answer I need. I have existing subscribers through my website ad I would like them to have access to the premium content in app (it’s the same material, just easier to use in app). I understand that NEW subscribers will have to go through app for the paid subscription, however the existing subscribers who are already paying through Stripe/Paypal, can I verify they’re subscription on signing in and then give them access to the good stuff, or will it need a completely new subscription?
Thanks in advance

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