What does unsuccessful authentication mean? Thaabit Mollagee March 09, 2016 10:56 Updated Follow This mean that the 3D secure OTP (One Time Pin) was entered incorrectly. Related articles Why do I receive an error, transaction index required? Wirecard API Response Codes Wirecard Debit Order User Guide How do I process a refund? What does validation failed mean? Comments 0 comments Please sign in to leave a comment.