Add the mod: 2198615778
For single player go on your computer to SteamLibrary\steamapps\common\ARK\ShooterGame\Saved\Config\WindowsNoEditor
Open GameUserSettings.ini with notepad.
Open steam and go to your own user page, check the last digits in the url and copy those.
if you do not see an url, go to your left corner, click on steam, go to settings, than to the interface tab than check the 4th browser/url box and close.

Under [serversettings] in Gameusersettings file place this header

[FCSS]
OwnerID=765311980004556345 (This schould be your id, those last digets you copied from the url.)

Now load up the game and press F1 in the game, the shop should open.
In the right corner of the ui there now is an admin option.
Press it, and you will be able to edit.
Go to category, make a new one.
Then Go to create, make a title and description go 1 tab down, add a price (or optional a level needed to purchase), sellect the category you made.
Now the last tab.
This is where you need to copy paste code's
You will be needing these atleast these two links
https://ark.fandom.com/wiki/Item_IDs
https://ark.fandom.com/wiki/Creature_IDs

The codes should look like this.
/Game/PrimalEarth/Dinos/Toad/Toad_Character_BP.Toad_Character_BP
Put that in, and you see dino's or items, a few more options for dino levels, male of female and you are done.
Press create on the bottom and you have made your own shop, and learned alot. :)