Can I use my debit card while traveling internationally? You may use your Strata Credit Union MasterCard Debit Card or Credit Card worldwide. Please call us before you leave to place a “Travel Notification” on your card for better security and reduce the chances of your card being restricted or blocked. Never rely solely on one card for your needs. Transactions in foreign currencies will convert to US dollars on the date they post to your account. Credit card transactions are subject to a 1% foreign transaction fee. You may call our Card Department at 314-542-7111 if your card stops working or is lost or stolen.