We've added, besides the already existing country_id, the country_code to the transaction services. This means you will see (for example) "country_id: 178" ánd "country_code: US" in the response. Later on we will remove the country_id from the response, so please update your software.
Also, we've added currency_code to our platform, this field contains the ISO 4217 currency codes. At the moment this field can only contain EUR as a currency code, but more information will follow later on.