Multi-currency management is a standard feature in Dynamics 365 (or rather in its underlying platform: the Common Data Service for Apps).
Administrators configure each desired currency (USD, EUR, GBP…) and their exchange rate with the system “base” currency (there can be only one base currency per environment, and you define it during setup: it can’t be changed afterwards).
Exchange rates…
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Currency management in Dynamics 365 / CDS for Apps
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