Im new to back-end and still not getting if I will need any database to work with moltin like MongoDB.
Afaik Moltin cannot be self-hosted and thus the answer would be no, you don’t need your db.
What about the currency, im from brazil so my store would be here. I would
only sell in R$ my currency.
You can define any currency on your Moltin dashboard and simply introduce the exchange rate.
Thx for the informations it was helpful.