When you kill a player, you gain credits. You can use these credits to buy stuff from a virtual shop.
/pvpcredits - Lists how many credits you have
/pvpcredits buy [Itemname] - Purchase an item from the virtual shop. Purchasable items are configured via the configuration.
creditsperkill: 30 shop: diamondsword: name: Diamond Sword price: 50 id: DIAMOND_SWORD extradata: 0 enchant1: type: DAMAGE_ALL level: 3 enchant2: type: FIRE_ASPECT level: 2 enchant3: type: none level: 0 enchant4: type: none level: 0 spideregg: name: Spider Egg price: 100 id: MONSTER_EGG extradata: 52 enchant1: type: none level: 0 enchant2: type: none level: 0 enchant3: type: none level: 0 enchant4: type: none level: 0
See the plugin in use on this server: play.diplomacycraft.com