After generating your related QR codes from the many online sites that offer this possibility, the App will verify and store the unmarked codes present in your list in a google sheet ...THE STEPS TO BE TAKEN ARE1) Generates alphanumeric codes from a generator easily available online (eg. NG5Ys10).2) Create a new "google sheet" and make it shareable by "Share".3) Paste the list of codes in a cell (usually 2A)IMPORTANT: the codes must be separated by a comma from each other.4) Generate QR codes from a readily available online QR code generator.5) Save the PNG or JPG of the QR codes in a folder naming them with the name of the alphanumeric codes.6) Paste the link of the Google sheet that you made shareable, where required in the App.7) Give the QR codes to the people who are entitled to them.8) You are ready to check the validity of your tickets with the App.PLEASE NOTE: Remember that it is very important and functional that codes are separated by a comma from each other and that the link of the google sheet is shareable.Good job everyone!CONTACTS: 3533759415 (WhatsApp)