Used Plastiq to pre-pay some of my rent to meet min spend on Amex Biz Plat card. Biz Plat gives 1.5x MR if you make a purchase in excess of $5k. Since my rent is $3k (and since my management company was fine with me pre-paying a month), I had Plastiq send a check for $6k. Since I get 1.5 MR instead of just 1x MR, it effectively turns the Plastiq fee into 1cpp. Happy to pay 1 cpp for the peace of mind in knowing that I met the min spend organically, so no chance of clawback.