Currency conversion - gogetssl/whmcs-addon GitHub Wiki
The Currency Conversion
Available starting at 2.7.4. version
That feature is useful for those who wish to auto-convert all prices within the WHMCS SSL addon to different currencies. That is required, when for example at the GoGetSSL account you have USD prices, but in WHMCS you trade in EUR.
The field can be left blank if the currency in WHMCS and GoGetSSL accounts are the same.