Security & Fraud Prevention

• Why was my transaction flagged as fraud even though it's legitimate?
• What does "Fraud/Security Decline" mean?
• What does "Transaction declined by authorization system: Authenticated Transaction Denied (Challenge)" mean?
• What does "Error(180): Response Code 700 - No user redirect 3D authentication" mean?
• Why was my transaction declined with "Response Code 593 - User in blacklist (Email)"?
• What does "Error 20026 - Your email address is blocked" mean?
• What does "Geolocation Blacklisted" mean?