Your card needs to be authorized to be used in every country you would like to make a payment to.
You can confirm the authorized cards per each country in two locations:
Your Wallet on the Dashboard
On your dashboard wallet the card will display the flag of the country the card is authorized to be used in.
"My Wallet" on the Left Pane
Click on the 'My Wallet' icon on the left pane and a summary of authorized cards per country will be provided.
The flag icons allow you to toggle between each country's wallet. You can delete and manage your cards here.