List of token IDs associated with the voucher.

A Voucher belongs to a Voucher Group and is uniquely identified by a code.
It can be linked to multiple tokens (idtags) and appUsers.

When a driver starts a session at a location, the system checks:

If the driver’s token is linked to a voucher, or

If the driver’s appUser (linked to that token) is linked to a voucher.

If either is true and the voucher’s group is associated with the location, the voucher is applied — potentially affecting pricing or granting access.