Buying Items
Use /shop buy item:<item> [cantidad] after finding something in /shop view. You can buy up to 100 units in one command. Kakashi calculates price × quantity, checks that the item is actually buyable and confirms that you have enough Ryō before changing your inventory.
If any of those checks fail, the purchase does not partially complete: you are told what prevented it. This matters when buying in bulk, because the total can be much larger than the single-item price shown in the catalog.
For an unfamiliar item, open /item info first. It is especially useful for materials and prepared tools, where the value comes from another system rather than from an immediate effect.