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McKay Development

How to check if the items received are trading cards ?


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I'm currently stuck with something that I assume is very simple, but I can't find any tutorial or help about it anywhere on the internet...


I'm currently trying to create a bot that trades random Steam game codes for random steam cards, but my problem right now is that I don't know how to check if all items that the bot will receive are trading cards.


I'm aware that this probably is a really easy thing, but I really have no idea where to find my answers :/



Thanks a lot for reading this, hopefully you can me with that :P


This is what I have done so far :

//This is where the pain begins.
function processOffer(offer) {
 if (offer.partner.getSteamID64() === config.ownerID) {
} else if (offer.isGlitched() || offer.state === 11) {
    console.log("Offer was glitched, declining.");
} else {
    var theirItems = offer.itemsToReceive
    var ourItems = offer.itemsToGive


manager.on('newOffer', (offer) => {
    console.log("Offer received, processing");
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Do something like this:

let isEachItemATradingCard = theirItems.every((item) => {
	if (item.appid != 753 || item.contextid != 6) {
		// AppID is not "Steam" or contextid is not "Community"
		return false;
	let tag = item.getTag('item_class');
	if (!tag || tag.internal_name != 'item_class_2') {
		// Not a trading card
                // You could also check that tag.localized_tag_name == 'Trading Card' but that would only work for English
		return false;
	return true; // all checks passed
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