← All 3DS flows
Hotel / Resort Website (top level)
3DS flow:
Overlay iframe inside OPI
. The challenge loads in a child iframe of OPI; nothing navigates. This page only embeds OPERA.
Embedding attributes (applied to hotel → OPERA and OPERA → OPI iframes)
allow="payment *"
sandbox
without
allow-top-navigation
OPERA frame height
px
Reload page
Apple Pay / Google Pay in cross-origin iframes need
allow="payment"
on every ancestor iframe.