Saw this one on the account pages today. You need to use your card in a contactless mode (not the chip or the mag-stripe) for 3x miles. Getting this to work will be entertaining...

In the UK, the limit in many merchants is £15, with recent changes trying to bring it up to £25. In Europe, the limit is €25. In the US, between $30 and $50.

This limit in practice, means below the limit, the transaction is taken contactless, and above the limit means the chip is used. In some places (in my experience so far only a pub in WLG), transactions above the limit will require a PIN, but are still contactless.

The Agip petrol station near MUC, McDonalds in many countries (UK, CH, US), STAR Tank in Germany, and Viapiano locations in Germany. Walgreens in the US, and Staples in the US are locations where I've used contactless cards. Just remembered, some Starbucks (US, AU), Pret-A-Manger/EAT (UK) and a DIY chain in SYD.

The promotion only makes sense if you're using the card for many small value transactions. With German petrol prices, or taking some people for dinner, it's not really going to work