I wasn't sure where to post this. I had much of it in a thread about our pre-tour hotel choice for next spring, but I thought the lesson I learned might be valuable to a broader audience.
I had booked us for three nights at a Haarlem hotel before our spring 2018 21 Day BOE tour. There was a bit of a problem with our credit card; I didn't realize (naïve, I guess) that when you gave your CC number to reserve the room, the hotel actually does a "pre-authorization charge," so I didn't warn my bank to expect a European charge. (Of course, I always tell them when we're going to be out of the country, or even out of state. ) It took three emails to and from the hotel, one automated "possible fraud warning" phone call from our bank, one phone call to the bank, and a follow-up call from the bank to get it cleared up.
I've never had that happen before; we always give a credit card number to secure the room, and it's never been questioned. Huh. Now I know, and I pass the tip on to you.
I did learn a lot about the process though, chatting with the credit card person at our bank. It might be worth a few minutes of your time to see how your bank actually handles foreign transactions, including "pre-authorization charges."