While you can already use XSplit Gamecaster to connect to Twitch directly, you may optionally want to use Custom RTMP to connect instead.
This guide shows you how to obtain the Stream Key and Stream URL from Twitch as well as set up the Custom RTMP account on XSplit Gamecaster.
Obtaining the Stream Key:
On the Twitch homepage, click on your Twitch username then Dashboard.
On the Dashboard sidebar, click on Settings.
Click on Stream Key.
Click on Show Key.
Click on I Understand.
The Stream Key shown will go to the Stream Key field on XSplit Gamecaster.
Please make sure that you keep your Stream Key private.
Obtaining the RTMP URL:
Select a server Location geographically nearest to where you are streaming from the list.
The RTMP URL shown will go to the Stream URL field on XSplit Gamecaster.
Setting up Custom RTMP:
Click on the Accounts tab.
Under Live Streaming, click the button and select Custom RTMP.
Enter the RTMP URL and Stream Key you obtained above.
The Stream URL is optional. This can be a link to your YouTube channel page.
The Custom RTMP service you set will show as configured on the Accounts tab and you will be able to start streaming through the XSplit Gamecaster overlay.