Card Number Chunk Usage Frequency

This check fires when the number of transactions associated with the same first-12-card-digits exceeds the configured threshold. The time threshold is a moving window calculated backward from the moment of the transaction. 

Fraudsters often target a particular range of credit card numbers for some attacks. This check is aimed at generalizing the card number velocity check to also include velocity across an entire BIN range. 

Configuration Options

  • Merchants can establish a threshold for both the number of transactions and the timeframe allowed. The default is 6 times over 6 hours.
  • The risk fires on the transaction after the set threshold. So, if you set a threshold of 6 in 6 hours, it fires on the 7th transaction in that 6 hours.