Castr is integrated with Facebook API and it's available in the Multistream Plus plan and above.
If you have one of the above plans then you will be able to connect and stream to Facebook without manually configuring the platform each time.
Follow these steps to link your Facebook Account with Castr.
Create a new Multistream (Simulcast) or All in One Stream
Click Add Publish Platform
Choose Facebook Live
Click Continue with Facebook
After your Facebook account is linked, choose the page / profile which you want to stream live with and type a description for the stream as well.
Click on Save to add the platform
Note: When you add Facebook as a platform, you will be given and option to toggle "Enable Continuous Streaming." With this option enabled, you can stream longer than 240 minutes but the video will not be saved in Facebook. If you have this disabled, the maximum length of the video that you can stream to Facebook will be 240 minutes.