How to organize multicurrency safely?

Question

Django

Hi everybody!
In general, there is a resource with multilingualism and 2 currencies (dollar and ruble). It has goods with prices in rubles and dollars, if the language is not Russian, then all prices are converted into dollars. Each user has a personal balance, the ability to place goods in any of the 2 currencies and the ability to change the profile language setting.
The question is, what about balance? Convert it to the currency according to the language setting or keep the balance in the currency specified during registration, for example?
Another option suggests itself to make an internal currency, set its rate and solve all issues in the bud when replenishing the balance, but I'm not sure that this option will be accepted from above.
Need your advice guys!

Answer 1

You still have the main currency - and I think this is the ruble.
When pricing in any other currency, your exchange rate is applied
Personal user balance - what is meant - the balance can be in the account or wallet - how much money is in it now and what kind - if it is a multi-currency wallet - then there may be dollars and rubles, regardless, if single-currency - then one currency.
Then you have some kind of payment gateway through which you accept payments - and it is most likely single-currency