Membership 2 – pre-existing members

We've just started using Membership 2 Pro with this site but already had a few people who'd signed up and paid using PayPal before we added the plugin (they did it manually before we worked out we'd use this plugin). Is there any way to add them as members and mark them as having paid so they don't get reminders to pay monthly when they've already done it? It's just 5 users and moving forward all new users will use the proper system along with Stripe but we want to ensure these pre-existing members still get a good experience.