Hi! Try
https://steamcommunity.com/tradeoffer/new/partnerinventory/
steam using this endpoint to get partner inventory in tradeoffer create window
let qs = {
sessionid: this._community.getSessionID(),
partner: steamid,
appid,
contextid
};
if (start) {
qs.start = start;
}
let refererUrl = 'https://steamcommunity.com/tradeoffer/new/?partner=' + steamid;
if (token) {
refererUrl += '&token=' + token;
}
this._community.httpRequest({
method: 'GET',
uri: 'https://steamcommunity.com/tradeoffer/new/partnerinventory/',
qs,
headers: {
Referer: refererUrl
},