I’ve got a free and standard $10 subscription setup In Ghost, works fine. I then went to my account in Stripe and created two other subscriptions for some more expensive in-person classes. My intent was just to provide a sign-up button in Ghost posts, not necessarily Ghost tiers for these in-person classes. I was pleasantly surprised to see that even though that new in-person class subscription wasn’t setup in Ghost, it still sends them a Ghost email and gives them access to the $10 subscription posts, because all are considered “paid” accounts under my Stripe account. Ok, so that’s fine… but now I am considering actually adding the in-person classes into the Ghost Tiers as well… but I see no way to integrate existing Stripe subscriptions into those Ghost Tiers. Is it possible?