I think you forgot about digicash's product 'ecash'.
Claiming a 'first' in any field is difficult, to claim a 'first' in payment systems is a very tricky affair.
It may be that bitcoin is the first practical digital peer-to-peer currency but even that is up to interpretation, no doubt someone had something they launched that failed before it and plenty of people would disagree that it is practical as it is implemented today.