Get the current conversion rates between various different currencies.
Usage
conversion_rates(currency = "USD", key, ...)
Arguments
currency
The currency to use as a baseline. By default this is US Dollars; while it can
be changed to other currencies, that does require an 'Enterprise' OER key, and will otherwise
fail.
key
Your Open Exchange Rates API key. See their access plans
(particularly the 'forever free' plan linked at the bottom).