TECHNOLOGY- American financial services corporation Mastercard has signed a secret deal with search giant Google to track retail sales including offline shopping and online ad clicks in the US.
The two companies did not made the deal public. It was discovered by Bloomberg.
"This raises serious concerns regarding the use of private financial data," legal director Myles Jackman of Open Rights Group told the BBC.
"Will Mastercard be compensating their clients for the data they have given away to Google for their own financial gain?"
Google says users need not to worry and can opt out of ad tracking by switching off the web and app activity control.