Run /membership in the server and press Manage billing: Stripe's portal opens with your payment methods, and you can add or replace the card there. If a renewal fails, you keep your role while Stripe retries.
/membership in the server. Only you see the reply. It shows the tier you hold and when the current period ends.If you bought from a link rather than inside Discord, the server’s invite page has the same manage link and opens the same page.
Stripe retries a failed card over the following days, and you keep your role while that is happening — an expired card is the usual reason a renewal fails.
Update the card the same way and the retry goes through. If the retries run out before you do, the subscription ends and the role comes off with it; subscribing again from the server’s invite page is then the way back.
/membership shows your subscription as it stands right now, and re-applies your role if that is what went wrong — I paid but didn’t get my role is the page for that.
Run /membership in the server and press Manage billing, or use the manage link on the server's invite page. The role stays until the period you've paid for ends.
Yes, from the server's invite page: billing stops and the role comes off until you resume, and you keep the plan and price you had. Not during a free trial.
Ask the server owner — they were paid directly and flatpass never holds the money. Cancelling is not a refund: it stops the next payment and returns nothing.