Capital One Credit is not a good card for foreign travel. It used to be. Now every foreign charge gets flagged as a possible fraudulent transaction and your card will not be usable until you respond to an email referencing that transaction.
My recent experience involved booking a concert in Barcelona.
The capital one system was so slow that the foreign merchant declined my concert reservation before capital one sent out an email.
There is not a way around being continually hooked up with email to capital one for foreign travel.
They used to have a system in which you advise them of travel dates and travel countries and transactions from those countries in that timeframe would be approved.
Now they decline every foreign transaction until you get a chance to approve the transaction via email.
So you have to have an email system that works in a foreign country and be in a place that has Internet connectivity.
If you are in the middle of Galicia (the northwest corner of Spain) your Internet connectivity may suck.