no value
LRG-HullDock-1000 - Chicago Sailboat Charters
What this gets you immediately
When the iframe updates to /sail-details/?page=1... → parent gets booking_details_view
When it updates to /booking/?Page=2... → parent gets booking_payment_view
Then we add the success detector once you capture the post-payment URL or success DOM marker.
2) Parent side: receive the message and fire GA4 events centrally
Add this to the marketing site (parent) via GTM Custom HTML (All Pages on booking page):
