How did Amazon know my new Visa card information before me?

When my new card arrived from NatWest it had the same details as one already listed on AmazonI was Christmas shopping on Amazon and realised there was a payment card on my account that I had never seen or used before. I only have one card registered and, although it was due to expire at the end of the month, it was still valid.Amazon told me the new card had been added to my account on 12 December, but couldn’t explain to me how.Continue reading...