In your Tolstoy account, navigate to Plans. Click on Current plan.
You'll be redirected to your stripe page. Click on the pencil next to Update Information.
Update your billing information. and click on Save once you're ready.
And that's it! Your next invoice will now contain your new billing information.
Keep in mind that due to Stripe's policies, it's currently not possible to modify existing invoices. However, the new details would apply on your next invoice.
If you encounter any difficulties updating your billing information, don't hesitate to reach out at Support@gotolstoy.com and we'll get back to you ASAP.