Problem
FOLIO currently retrieves currency exchange rates via API from the European Central Bank. These exchange rates can be overridden on a per-POL basis. Currencies not supported via the ECB API must also be entered on a per-POL basis. Many libraries are required to use (or prefer to use) a different exchange rate based on their own financial processing rules. To this end, libraries should be able to specify alternate means of fetching exchange rates.
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