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Nothing
Time to kick your brain, all things do not comes all cooked.
The job of programming is also CREATING SOLUTIONS.
For the barcode, you have to ask yourself some questions and answer them. The answers will tell you what to do.
'Why a barcode ?' :
- if answer is 'to make the ticket look modern', any barcode with any content will do the job.
- if answer is 'For security and control', it open more questions: 'What data do I need ?', 'What are the security features ?', 'How does it prevent fake tickets ?' ...
This thinking is practice for future job, the more you practice, the better you get. But only you can do it. It is like learning to read and write.