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Usage: [currency]800[/currency] [currency base="USD"]2000[/currency]

Only base="XXX" is supported, where XXX is the three-letter currency code (GBP, USD, EUR etc.) This plugin has GBP as the default base currency. If you want a different default base currency or output format, fork the plugin.

The ~ character is included in the output to indicate that it is only an approximate conversion, as the geoplugin.net rates will be different to the rates you might actually use.