Our Stripe payment system doesn't accept Amex in our region, as it's not as widely used here in Europe.

If you have a Visa or Mastercard available, those should be compatible with our payment system. You may also consider checking if there's an option to change your payment card details through the provided link: https://billing.stripe.com/p/login/28o3cw5Gvas10OA8ww

If you continue to experience issues or have any further questions regarding payment methods, feel free to reach out to us for assistance.