Using Groovy to access and parse an exchange rate API

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I live in Canada and do a fair bit of work in other countries, so when I do my bookkeeping, I have to convert revenue and expenses in foreign currencies to Canadian dollars. I used to do this by laboriously looking up historical exchange rates at the Bank of Canada, but last year the bank reduced the number of currencies it supports. I decided to look for a different and more practical solution, using a website that publishes historical data on currency exchange rates and Apache Groovy, a programming language for the Java platform.

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