What currencies can I accept payments with Tap to Pay on iPhone?

You can accept Visa, Mastercard and American Express contactless cards from UK or foreign issuers, but all transactions and settlements will be in GBP. 

Apple Pay also keeps your purchases private. When you pay with your Tide card via Apple Pay, Apple doesn’t keep transaction information that can link the purchase back to you. You can see transaction information on your Apple device and in your Tide app, but Apple doesn’t store this data on their servers.

Of course, you need to make sure you protect the security of your Apple device, just as you would with your Tide card.