SunriseM

Added id property to objects pushed to itemsToGive and itemsToReceive when building a trade offer (PR #225) Made the TradeOffer class exportable for use with Bluebird (PR #227)This still isn't officially supported and may break in the future if you rely on it Updated getExchangeDetails to use new WebAPI method which has greater reliability  
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Try with client.gamesPlayed(["Custom message", 440]);

Did you try writing  the client.on('chatHistory',..) part before client.getChatHistory?

If you set a password, it will be encrypted so you will have to disable it first

You can use "split" to convert the string to array and get the part you want. Example:
client.on('friendOrChatMessage', (senderID, message) => { //Example Message: /bet 45 var arrmsg = message.split(" ") //arrmsg = ["/bet","45"] var userNumber = arrmsg[1] if (message.indexOf("/bet") == 0){ client.chatMessage(senderID, 'Your bet is: ' + userNumber); } });

You can use "split" to convert the string to array and get the part you want. Example:
client.on('friendOrChatMessage', (senderID, message) => { //Example Message: /bet 45 var arrmsg = message.split(" ") //arrmsg = ["/bet","45"] var userNumber = arrmsg[1] if (message.indexOf("/bet") == 0){ client.chatMessage(senderID, 'Your bet is: ' + userNumber); } }); You will have to add other things like be sure that input has /bet [number],  verify the number can be used, etc

You should use a loop (for, foreach, while, etc) to iterate all the inventory callback, you can create an array called items, and in each iteration you push a object like this one:
var item = { "assetid": inventory[i].id, "name": inventory[i].market_hash_name } if you need to make an asynchronous operation with that info and know when all iterations are finished, you can use async module.