Ask them for their cardnumber and their bank name/brand.
Then ask the bank how you can sort it out.
Then you use the card number as account number.
But do remember if the people have a valid card then the people can still go on a spending spree.
I have received a letter from the company that runs our complex's admin processes.
It goes something like this:
That on the 15th of December Judge Splig ruled that the above 3 were not allowed to turn off water or electricity on any property unless due process has been followed.