If, following your booking attempt, you haven't received the confirmation email associated with your payment titled "Your receipt from Jool," it means your payment didn't go through, and no car rental is reserved.
There could be several explanations for this; here are the most common scenarios:
You encountered a 3DS issue (3DS or 3D Secure is the SMS or app-based authentication system implemented by your bank to secure your online purchases). In this case, try the payment again, ensuring you complete any actions requested by your bank.
You exceeded your card limit. All cards have a rolling limit for possible payments over 10 or 30 days. If you're in this situation, check with your bank or in your personal account. Most banks allow you to increase your card limit through your personal account. Once the limit is increased, you can retry the payment.
Your card has expired, or you recently reported it lost or stolen. You'll need to use a valid card and retry the payment.