Originally Posted by
8420PR
The type of card is determined based on the BIN (bank identification number) which is the first 6 numbers of the credit card. I think it relies on someone maintaining the correct data (probably in multiple databases worldwide). I have a DKB M&M personal mastercard which on many websites is identified as a business card (and a surcharge charged)....
You can check one database here:
https://www.bincodes.com/bin-checker/
When I switched from the commercial to the private M&M DKB card the first 6 remained unchanged, but the 7th digit changed. So either DKB has not set up the BIN properly or the system is flawed. My private M&M DKB card is identified as a commercial card, too. Using my corp credit card and private credit card issued by the same provider the cards showed properly as commercial and private respectively.