Mastercard 4834 — Point-of-Interaction Error

What it means

An error occurred at the point of interaction — terminal, checkout, or payment flow — causing incorrect processing.

Common causes

• Terminal misread or duplicate tap/dip
• Checkout bug charging wrong amount or twice
• POS integration error during payment capture

Evidence that helps you win

• Terminal or checkout logs for the transaction
• Single authorization matching a single order
• Proof of correct amount and one successful capture
• Customer order record aligned with processor data