is there an international transaction fee

For information about foreign transaction fees, see the following from: https://www.goldmansachs.com/terms-and-conditions/Apple-Card-Customer-Agreement.pdf

TRANSACTIONS MADE IN FOREIGN CURRENCIES

Transactions, returns and credits made in a currency other than U.S. dollars will be converted into U.S. dollars. We do not add any foreign exchange rate fee to these Transactions. The conversion will be performed by Mastercard International, the payment network associated with your Account (the "Network"). The Network follows its own methods for conversions that are subject to change. The conversion will occur on the day the Transaction, return or credit is processed by the Network, which may be different than the date of the Transaction, return or credit. As a result, the conversion rate may differ from the rate as of a Transaction date or the date a Transaction is posted on your Account.

Apple Card has no foreign transaction fees. However, if purchases are made in any currency other than dollars, Mastercard International will charge you a conversion fees and possibly miscellaneous fees.

When I travel abroad I usually try to have the merchant charge me in dollars. I find it works out less expensive in the end.

No separately itemized fees whatsoever.

Any charges which do exist are rolled-up into the exchange rate.