Their website was down and there was some annecdotal evidence of problems with the payment system. These two systems are going to be a long way apart in their network topology so it's unlikely that the two are caused by the same problems. Payment systems drop out over the christmas periods for a lot of reasons and there is nothing to suggest that the outages were caused by anything at the card processor end as that would more likely bring about a total outage. The issues with some retailers are more likely to be because the card machine cannot get a connection to the processor due to the busy nature of the season.

In the words of Slashdotters everywhere... nothing to see here.