There is a lot of discussion upthread on this, but the best way is just to pay for stuff you’d be buying anyway - utilities, medical bills, retails, online purchases, etc. If you are going to buy a ton of them you may need to get more creative.

Technically that may be true, but miles have posted for every other promo they have run, whether the code shows on the eshopping page or not. Perhaps that will change one day, so there is some level of risk. But worst case you paid $287 and received $300 even if the miles don’t post.