Mr Chen Junyi's letter about being asked to write down his credit card's CVV (card verification value) on a form ("Maintain security of credit card info"; Dec 15) reminded me of the time I wrote to FairPrice, asking it not to request that customers fill in their full NRIC number on lucky draw forms.

Sheng Siong supermarket requests only the last four digits of customers' NRIC numbers.

There have been cases of people using another person's NRIC number to visit the polyclinic and leave without paying.

Lucky draw forms with customers' full names, NRIC and phone numbers and addresses should not be displayed in public, nor should these details be revealed to the public in any other manner.

Only minimal information should be requested from customers in order for winners to collect their prizes.

Teo Keng Leong