A. Check your account settings to ensure that your payment information is up to date. Log in to your MyTheresa account, navigate to 'Account Settings', and verify that your billing address and payment method are correct. If there are any discrepancies, update them and try placing your order again.
B. Clear your browser's cache and cookies. Sometimes, stored data can cause issues with the ordering process. To do this, go to your browser settings, find the privacy or history section, and select the option to clear browsing data. Make sure to select cookies and cached images/files, then restart your browser and attempt to place your order again.