What is transaction fraud?
Transaction fraud, including message tampering and injections, occurs when payment messages are altered, manipulated or artificially inserted as they move through the payment network. These attacks may change critical transaction fields—such as amounts, routing data, authorization flags or timestamps—or introduce entirely new, unauthorized transactions that appear legitimate. Because many fraud tools only analyze endpoint or post-processed data, transaction fraud often evades detection, increasing risk of loss, compliance penalties and reputational damage.