Payment may fail in the following cases, among others.
- When the payment amount exceeds the single payment limit
- When the daily/monthly usage limit amount is exceeded
- When the same amount payment is made on a different device within 5 minutes
- When the auto-charge method is unavailable due to insufficient balance, etc.
In these cases, when you perform Get payment details, the status will be "FAILED".
When you perform the Cancel a payment API, the status will also be "FAILED".