I don't know if "PlayStation Vue" is a specific Roku channel (forgive my ignorance) but if it is, you can deeplink to it by finding it's ID and triggering the deeplink with a URL Post.
https://sdkdocs.roku.com/display/sdkdoc ... toachannelYou can see what apps are installed by using the following URL (Replace ROKU.IP.ADDR with your Roku's LAN ip address)
http://ROKU.IP.ADDR:8060/query/apps Or from the Roku App itself:
http://localhost:8060/query/apps"
On the other hand, if PlayStation Vue is not an existing Roku app then you'll need to find how to deeplink to such device.