Myer is considering legal action against Latitude Finance for allegedly using the database of Myer storecard customers to expand its own credit card business, reports The Australian. Myer has dropped Latitude as the provider of its Myer branded credit cards and is launching a new card with Macquarie as provider next week. But customers were confused when they received letters from Latitude telling them their cards would automatically switch over to a Latitude Infinity Card (which comes with a A$69 annual cost), the paper reports. It says Latitude argues it was required to send a formal letter to the Myer customers informing them of the change, and that the contractual credit card relationship remains with Latitude until Macquarie takes over the Myer card. With the launch of the new Myer credit card next week, with Macquarie Bank as provider, Myer will become the first Australian department store to offer Apple Pay on its cards, The Australian also reports. Mastercard has launched an "early detection service" which it says will provide banks with "a unique advanced alert for cards and accounts at a heightened risk of fraudulent use based on their exposure in security incidents or data breaches". Warning it can take just nine minutes for stolen data (such as from the 143 million accounts hacked at Equifax between May and July this year) to be posted on the dark web, Mastercard says card issuers will be given a quantification of the estimated level of risk along with the alert. Banks will be alerted even if the account data "appears at risk but without sufficient evidence to declare an Account Data Compromise event", allowing them to choose to monitor transactions on that account more closely.