How are currency exchange rates updated?

Approvals & Disclosures uses an external service to handle currency conversion for amounts/values entered in requests in our system. We receive exchange rates daily, and the exchange rate used in a request is based on the Request Creation Date.  

When currency exchange rates are displayed, the UI shows the converted rate with a decimal. Decimal points are rounded to the 100th places (the second decimal place). Total amounts are still shown in the rounded Default Currency.