Function used in mission creation.

Objective. The player has to buy specific items. It’s possible to force the player to buy from a given NPC by entering its name tag.

name: Action name, only used by the mission designer.

npc_name (Optional): Tag of the NPC that the player has to buy from.

hide_obj (Boolean): Prevent the step to be displayed in the mission log.

overload_objective (Optional): Allow to set a specific a description of the mission. See the text guidelines reference document for the formatting requirements.

roleplay_objective (Optional): Allow to add a description to the step.

Item/quantity/quality: Array containing the description of the items that need to be sold. See the complex item declaration for the formatting requirements.

npc_name (bot): $npc$

For item number X