Add alternate sources for currency exchange rates

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.

Use cases and requirements

Requirement	Status	Use case

Requirement	Status	Use case
Library should be able to update currency exchange rates via API from library-defined sources	pending	Institution’s financials rely on a relationship with an external financial institution, which provides exchange rates via API. Library should be able to configure FOLIO to use that API
When library is using a library-defined API, the default ECB integration should be disabled	pending	Institutions updating exchange rates via third-party integration should not have those exchange rates updated by the native API.
Library should be able to specify exchange rate update frequency	pending	Libraries may only need to update exchange rates on a periodic basis (weekly, monthly, etc.), or may incur costs associated with queries, so will want or need to limit the frequency at which exchange rates are updated.
Support for file uploads	pending	Some providers make exchange rates available via downloadable file in csv or JSON format. In some instances it may be desirable to be able to upload a csv or JSON file rather than use an API.

Approach

Questions

Question	Status	Response

Question	Status	Response
Should alternate integrations be hard-coded or manually configured?	pending
In an ECS environment, should the exchange rate load be global or per tenant?	pending
Is there a use case where a library might want or need multiple integrations?	pending