Chase offer expiration & redeem deadline的区别?

收到att这个offer,有些奇怪的是offer expire on 7/12, must make the first two payments by 8/26 这是啥意思? :yaoming:

难道是7/12之前activate,然后只要8/26前两笔就行?但前面又说used by july 12,非常迷惑…