For some reason, the only vendor to show up on the vendors tap is Eververse. There's nothing for Tower, Reef, or Temple of Iron. :/
Update:
As of 7:04 am on 10/27/16, all the tabs are back out of nowhere. Still, I fear they may disappear if the app updates again like last time.
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Vendors were deliberately taken offline so we could fix a serious issue with them. Eververse was still up because it operates differently than traditional vendors. It was better to have something up than nothing at all. Anyways, if you run into more issues, feel free to make more threads. Sorry about the delay and confusion. Perhaps we can add more offline messaging for when not all of the tabs are working.