Search a compatibility : How to sell MythicMobs items to a NPC ?

Hi !

I would like to know how to sell MythicMobs items to a NPC (exemple a citizens2 npc), how to set a price and wich plugin to use, because each plugins i found ask for an item ID and i can't set an ID using mythicmobs i think.

I precise i want to do this using a NPC and inteface, i don't want players to sell using a command.

Thank you