Thank you for looking in to this but if we use 8th wall with this client then we won’t get them back in playcanvas and we ideally want them on your platform. Do you have any ideas as to potential workarounds for this using playcanvas so we can keep this client and all of their future projects on your platform.
You can use 8th Wall with PlayCanvas: https://medium.com/8th-wall/release-12-endless-image-targets-a-playcanvas-integration-new-launch-controls-more-b4f0283f9397
We have a few users that have done so 
Until the API opens up for WebXR to capture the display, there isn’t anything we can really do on our end.