3 ms·
I've heard (unsure if true) it was to reduce entropy. IE they keep the last 4 digits of your credit card, combined with a post code you have a unique id.
by aaron695 10y ago
I've heard (unsure if true) it was to reduce entropy.
IE they keep the last 4 digits of your credit card, combined with a post code you have a unique id.
- heywire 10y agoNot necessary, most point of sale systems can provide a unique hashed or tokenized version of the account number for analytics and identification purposes.