Abstract: Aspects of the disclosure relate to detection of unauthorized usage in debit card transactions using a transaction management computing platform and an analytics computing platform. A computing platform may monitor a plurality of transactions at an automated teller machine. Subsequently, the computing platform may identify at least one unusual activity in the plurality of transactions at the automated teller machine. In response to identifying the at least one unusual activity in the plurality of transactions, the computing may analyze each account corresponding to the plurality of transactions to identify a common point of purchase for a subset of accounts. Thereafter, the computing platform may flag the subset of accounts for unauthorized usage.