Supported websites...
<pre>
https://humblebundle.com
https://fanantical.com/
https://g2a.com
https://eneba.com
https://www.steamtrades.com/
https://store.steampowered.com/
https://epicgames.com/
https://gog.com/
https://itch.io/
https://barter.vg/
https://www.reddit.com/r/SteamGameSwap/
https://www.reddit.com/r/indiegameswap
https://www.reddit.com/r/*Game*
https://www.reddit.com/r/IGSRep*
</pre>

Tell me if you want more sites supported.