Hi there! I see you're having trouble with your credit and debit cards not going through when trying to order books and DVDs on ThriftBooks. Let's try to get this sorted out together.

First, can you tell me if you’re using the ThriftBooks website or their mobile app? Also, have you tried ordering with these cards on another site recently to confirm they’re working? This info will help me guide you better.

In the meantime, here are some initial steps to try:

1. Double-check that the credit/debit card details you entered (number, expiration date, CVV, billing address) match exactly what your bank shows.
2. Clear your browser cache and cookies on your WebKit browser (since you’re on Windows 10). Sometimes old data causes payment errors.
- To do this, go to your browser settings, find the privacy or history section, and clear cache and cookies.
3. Try using a different browser or device if possible, as sometimes compatibility issues cause payment failures.
4. Make sure your cards have not expired and that there are enough funds or available credit. Also, some banks block online or international transactions by default—checking with your bank can help.
5. Disable any VPN, proxies, or ad-blockers during checkout, as they might interfere with payment processing.

If none of these solve the issue, there could be a problem on the ThriftBooks payment processor side or account-specific issues. Let me know what you’ve tried and I’ll help you dig deeper or get you in touch with the right support team.

Does this sound good? Any details on what you’ve tried will help me assist you better!