Everything, organised.
Five focused reads covering the full lifecycle of a barcode ticket — from the moment it is issued to the moment it opens a gate.
How barcode tickets work
The full pipeline: issue, deliver, present, validate.
Ticket formats compared
QR, PDF417, Aztec, Data Matrix and Code 128 side by side.
Scanning tips
Brightness, margins, glare — why scans fail and how to fix it.
Mobile vs. paper
Where each format still wins in 2026.
Ticket security
Signatures, rotating codes, and the honest limits of each.