Nfc tag and new ID how to implement?

Question

Android

How to pull off such a scam?
There is an nfc tag on which something is written, the user leans his device and a dialog is displayed on his screen:
Your identifier xxx01
Question: What is your name?
Input field
AND OK button
Some other information is possible

The identifier is attached to the device by some method
After pressing the button, information about the ID and name is transmitted to another device

Another person leans the phone and the same thing, only ID xxx02

And so for each specific user. And when leaning again, there should not be a new ID, the ID that has already been assigned to the user should be displayed, and only his ID, name and other additional information will pop up on the screen, which will also go via the Internet to his device.

How could this be easier to implement?
As I understand it, nfc should contain an appeal to the site where new information is entered, in addition to the ID, information on the type of system information, ip, etc. will be entered there.

Answer 1

Write a unique code on the nfs tag.
When checking it by the application, check its presence in your database. If it is not there, give the number and enter it into your database. And if there is, then the output is the number from the database.