---- Update balance ---
-c ADD <user> <ammount> "<reason>"\n
-s 200 Add OK\n or 403 Not Coke\n or 404 Bad User\n
---- Set Balance ---
-c SET <user> <balance> "<reason>"\n
-s 200 Set OK\n or 403 Not allowed\n or 404 Bad User\n
---- Get Users Balances ---
+--- Alter balance ---
+c ADD <user> <ammount> <reason>\n
+s 200 Add OK\n or 402 No balance\n or 403 Not Coke\n or 404 Bad User\n
+--- Set balance ---
+c SET <user> <ammount> <reason>\n
+s 200 Set OK\n or 403 Not Coke\n or 404 Bad User\n
+
+--- Get Item list ---
+c ENUM_ITEMS\n
+s 201 Items <count> <item_id> <item_id> ...\n
+--- Get Item Information ---
+c ITEM_INFO <item_id>\n
+s 202 Item <item_id> <price> <description>\n
+--- Get Users' Balances ---