How to work with different currencies when replenishing an account?

Question

Database

There is an application with an internal account. Now the only currency in the system is rubles. It is necessary to introduce several more currencies (dollars, euros, hryvnias...) to simplify the work with the service for users from different countries.
I have only one thought about this: leave one currency in the system, and the client part will simply display the value obtained based on the exchange rate. But in this case, when replenishing the account (Yandex Kassa is used), rubles will be visible to everyone. How critical is this and how best to do it?
Well, the main problem with this approach is a change in the exchange rate, and as a result, a dynamic change in the amounts of payments made, which can mislead the user.
Maybe someone has a ready-made structure for the database or recommendations for working with currency on the server?
Any advice would be greatly appreciated, thanks in advance.

Answer 1

It is better to open accounts in specific currencies and specify the currency for the transaction.
Whether one user can have several accounts in different currencies or only 1 is up to you.
I'm in the debt tracking app https://DebtsTracker.io/ suggesting a default currency based on country/language.