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Simple API for currency conversion.
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Uses Exchange Rates Data API service to fetch rates between different currencies.
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Store these rates to the application MongoDB, so we don't have to use the service which has a limited free requests number each time we receive a request from a client.
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Update the database every six hours from the service with the fluctuations in rates.
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Build an API that takes two currencies and the amount the client wants to convert and returns the result.