Okay, so having signed up to Quidco, I think I get how it works when you order stuff online. But - there seems to be an 'in-store' option too. I've registered my bank cards but do I just now present that card in stores and I automatically get money back? Do I need to tell stores I'm going through Quidco? Or does it all just magically happen? Also, how long does it take for money back to hit your account?