Adding subscriptions as a purchase option lets you sell products on a recurring basis. Depending on the subscription options you offer, your customers can choose to pay an agreed price for your product in a scheduled frequency. For example, you can offer subscriptions on a monthly, weekly, or daily basis.
If you have a third-party subscription app from the Shopify App Store installed in your Shopify admin, then you can manage your subscriptions in the Shopify admin. When a customer purchases a subscription from you, the information about the product, and the frequency of the subscription, becomes available in your admin. To set up subscriptions, you need to complete the set up in the app that you install.
Customer payment information is stored securely by Shopify. You can't access your customers' full credit card information after it has been entered.
If you uninstall a third-party subscription app, then any subscription data, excluding subscription contracts and customer payment information, that you've created in the app is deleted after 48 hours. If the app has a backup mechanism in place, then you can restore this data at a later date.