It looks like Air BnB will only let you choose one of the following: Pay with gift card / or use a promo code at checkout. I can use my AMEX points for a $250 Air BnB gift card at a 1:1 points conversion but then I cant use a promo code on top of that. My question is: Can I book Air BnB with my AMEX card (regular transaction without points), apply a promo code at checkout, and then pay my AMEX bill with the points? Would that purchase be eligible for 'pay with points'? Will I get a 1:1 ratio on this? Is there a list of what your allowed to pay for with points with AMEX?