Three) "nextId" and "fromId" are for recurring question goal plus the ID by itself does not have any company implication.?? If not stuffed, or full of 0, it implicates to subscribe trade party only. If full of one, it implicates to subscribe both trade and cancellation activities. It can be https://huobi02457.pages10.com/The-smart-Trick-of-huobi-global-That-No-One-is-Discussing-50446682