It is a tool to transfer assets between the accounts of Kuna exchange users. Kuna Code also allows you to save or transfer any asset outside the exchange space, including exchangers.
In simple words, it is a 45-character code that gives you a balance when activated.
For example, this kuna code was in the amount of 100 UAH
You cannot reactivate it, as it has already been credited to the user's balance.
But you can create a new kuna code for any amount and give it to whomever you want.
More information can be found on the kuna code page.