Hi Yohanna,
I decided to use unique codes to avoid any possible abuse.
I sell my tours on my website and have integrated an online booking software. It was a long work for me to find one which could offer me the possibility to send one by one the code from a list that I would provide. I found my solution with Billetweb.
However, it is a French company, so I don’t know if their services are available everywhere.
Best,
Elodie
It is one pdf file that people get then buying a certain tour on my website (downloadable file with code, instructions and general travel tips). It has a code and a comment “the same code applies to the whole group if you bought the tour for multiple people” - as sometimes people buy 2 or more at once, to avoid confusion why it is only one code.
I even have a comment that the code is valid to use 30 days from the purchase - to create impression of uniqueness of the code and as I was planning to update that code in pdf regularly to avoid miss-use.
But I have not noticed any abuse, so I stopped updating the pdf file frequently. Probably the last time I updated was like 6 months ago.