Using the API is not an option because we're migrating the active subscriptions themselves, including credit card data. Payment processors can transfer this data between one another, and there is a standard process for doing so while retaining PCI compliance, but because LemonSqueezy's customer support has been unavailable I can't get them to carry out those steps. Migrations between payment processors are fairly standard, though. For example, see https://docs.stripe.com/get-started/data-migrations and https://docs.lemonsqueezy.com/help/migrating/migrating-from-...