If One Click Upsells plugin is compatible with WooCommerce Subscriptions, does it save the sensitive customers' credit card information to some database?

1.  Is your stripe plugin compatible with Woo Subscriptions?  That is, will you save credit card information, etc?

One Click Upsells by WooCurve is compatible with WooCommerce Subscriptions. But we don't save credit card information on your site, it is saved via payment gateways' API to their secure storages. Each service has it's own API methods of storing sensitive data (like Stripe, PayPal, Braintree and other). Your site stores only special hashes received from the API to charge the saved credit cards.