Failed payments occur when the payment transaction is unsuccessful due to reasons other than underpayment, overpayment, payment detected after order expiration or order cancelation exceptions. This usually results from invalid or rejected transactions sent to the blockchain or due to fraud detection systems flagging the origin address. Other legal or technical matters can also be responsible for this.
Failed payments will not be eligible for the refund process.
For further information about invalid or rejected transactions check Why has my payment been rejected or discarded?.