An “Unhandled Exception” error is a general message that appears when a payment attempt doesn’t go through.
It sounds dramatic — but in most cases, it simply means the payment was declined or couldn’t be processed.
❓ What Usually Causes This?
The most common reasons are:
The customer’s bank declined the payment
Incorrect card details were entered (card number, expiration date, CVC, or billing ZIP code)
Billing information doesn’t match what the bank has on file
This is typically a bank-side decline, not a system issue.
✅ What Should I Do?
Double-check the card details
Confirm the number, expiration date, CVC, and billing ZIP/postal code are correct.
Try the payment again
Sometimes a small typo is all it takes.
Have the customer contact their bank
If everything looks correct and the error continues, the customer’s bank can confirm why the charge was declined.