WolfHero
Official Terrarian
"stationaryMerchantItems" can be removed, "stationaryMerchant" is what you're adding to. "smItemShopNotEmpty" and "smItemDecorShopNotEmpty" aren't too important; it affects the Stationary Merchant's dialogue. If one or both of those tags are missing, he'll tell you that a shop is empty. If an item is added into either shop when those tags are gone, it'll add the correct tag.
For all the other tags, it's random. They have a chance of being added from the Traveling Merchant shop when the Traveling Merchant shop resets. The chance is 100% if the world is Hardmode, or pre_vanilla_bosses_defeated / 6. So the best you can do is try to remember what was already in the shop then add them.
Thanks. I'll just assume everything was in there since we had defeated all of the pre-hardmode bosses. That's the method to unlock stock in multiplayer worlds, right? I'll be testing in a bit to make sure it's working.
Also, I noticed the sm in the entries. Does this only work with stationary merchant-tagged item variable names, or could you theoretically add anything to the shop?