Use the currency_code field to specify the currency code in a request, for example:

{
    "transaction": {
        "tax_timestamp": "2025-03-01T12:00:00Z",
        "description": "Transaction description",
        "currency_code": "EUR",
        "buyer_name": "Test buyer",

Currency conversion

The service converts the transaction currency when required. For example, if an invoice must use a currency different from the transaction currency, the service converts the transaction currency to the required currency. If Canada requires an invoice to use Canadian dollars (CAD), for example, the service converts the transaction currency to CAD.

If no currency conversion is required, the service does not convert the transaction currency. You can send any supported currency to the service, and it retains that currency when no conversion is needed.

The API response includes information about any currency conversion, including the target currency, conversion date, and exchange rate source. In the following example, the service converted the transaction currency to British pounds (GBP), using an exchange rate from the Bank of England:

                "additional_currencies": {
                    "invoice": {
                        "amount": 82.59,
                        "currency_code": "GBP",
                        "fx_date": "2026-02-28T12:00:00Z",
                        "fx_rate": 0.825900231252,
                        "fx_source": "source_bankofengland",
                        "total_amount": 99.11,
                        "tax_amount": 16.52
                    }

Supported currencies

The service supports the following currencies: