Billing stops as soon as Shopify tells us the app is gone. Your store billing schedule is switched off, so no Shopify subscription contract is charged again, and your Mollie connection is switched off at the same moment, so no SEPA Direct Debit is collected either. Nobody is billed by us after an uninstall, and your subscription contracts are not canceled: they stay in Shopify exactly as they were.
About two days later Shopify asks us to erase the shop, and we delete your personal data and integration credentials, including Mollie subscriptions and their payment history. Your configuration is deliberately kept: plans, clubs, rules and portal settings survive. Reinstalling gives you the app back with those settings as you left them, and Mollie is reconnected by signing in again. "Subscription data and privacy" explains what is stored and for how long.
Stuck on any of this? Open the chat in the bottom right corner of the app and we will help you set it up.