いま、商品を買うためにたくさんカードを使っています。そのためにアメックスで支払いができないことがあります。
これからどんどん配送量が増えて行きますので、カードを変えても割引ができるようにしてくれませんか?
Recenty, I've been using my credit card a lot to collect stuff for my inventory. Therefore, sometimes I will need to withhold further payment via my AMEX card.
My shipping is prospected to increase fast from now on. If I use other credit card to pay to you, could you please allow me the same discount as I receive through my AMEX card?
Thank you for your cooperation.