Sounds like you control both a-page and b-page.Personally, I would not
have Launch in b-page at all. Instead, anything that needs to be tracked
should use window.postMessage() to send messages to a-page. Then,
configure Launch in a-page to listen for those messages, then track
accordingly.I had a similar setup where b-page showed a video and I
wanted to track those video interactions. So with every video
interaction, I used window.postMessage() to send information about that
interaction to my a-...