I thought I'd post this as I'm sure others end up with similar issues. We've lived in Italy for over a year, and while both our Chase and Capital One Venture cards work most of the time, we've had issues on occasion with on line purchases.
This week I had problem with Colosseum tickets and Borghese Gallery tickets two days in a row. As you go complete the form and submit for payment, you may see a "Verified by Visa" screen pop up telling you to not hit your back button, or refresh your screen. With the Colosseum tickets, after the Verified by Visa/Chase screen, a message came up saying payment was not successful, check your card number and try again. Tried again, repeat performance. So I called Chase, they said that they did not see any attempts and to try later. I told them I had this problem previously and would like to be transferred to Verify by Visa, so was transferred, where my identity was verified, sent me a text with code, which I read back. Verify by Visa confirmed that the transaction was attempted twice and blocked. So while they were on the phone, I tried again and purchase successfully went through. Even though I'd signed up for Chase's travel alert with various countries, Verified by Visa did not have any travel notifications for me, so gave them countries for 1 year. I told them I would be purchasing additional tickets from other merchants, and said they'd authorize transactions for 24 hours. Made several other online purchases for tickets (Vatican, and Italo train tickets) without issue.
The following day, when the Borghese Gallery tickets became available, I attempted to purchase. In this case it appeared the charge went through, but then there was one more screen to confirm purchase, and when I did that, the card didn't go through. Again says try again. Call Chase back (no attempt visible on their end), ask for Verified by Visa, waited on hold, order expired, so had to start from scratch again. This time the verify text didn't go through, so I verified myself by answering a couple questions relating to last job, mortgage company, and mortgage payment to verify my identity. Again, while they were on the phone, I successfully made the purchase, said I'd make a second one for the exact amount in the next 5-10 minutes, and they again gave me a 24 hour window. 2nd purchase went through without a problem.
Kind of a pain, and only seems to be an issue with some, but not all on line purchases.
Previously we had same issue with Capital One card, but when CO asked if there was a "verified by visa" screen (there was not) the person I spoke with said Capital One did not subscribe to "Verify by visa" so there was no way for Capital One to approve the transaction they couldn't see. When I tried the same purchase with Chase, I did get the "verified by visa" and had to call, same as above, to get purchase approved.
Hope this helps others.