I was able to buy some groceries and pay with card. The tills had a battery backup and the network infrastructure that supports card payments was apparently working.
That said, lots of people hit the cafés and had to resource to cash payments. There was also lots of people buying bottled water at the shops.
So basically, you could divide people in two groups. Those that took it like an extra Sunday, and those that took it like the beginning of a war or something :-D