Philip Rowlands <phr@doc.ic.ac.uk> wrote: > Therefore, when fraud or card loss occurs, they can't create a new card > number, only a new issue number. Without it, the transaction is > probably refused. The issue numbers are, in my experience, both highly > predictable and sequential. And, in my experience, transactions can go through with an issue number of "0" (when this is obviously not a valid issue number).