Hi team,
The on Receive Communication handler suddenly stopped firing on localhost in sandbox while everything still works perfectly on staging.
- Transaction is processed successfully in sandbox
- No transact Response is ever posted back to parent page
- Handler is bound correctly on page load (confirmed with console.log)
- No breakpoints hit, not even on initial i frame load
- Was working fine until early November 2025
- Using latest PHP SDK (updated Oct 2024)
- Full HTTPS with valid cert, no mixed content
Staging server (public domain) works 100%. Only localhost is broken.
Have there been any recent sandbox/CSP changes that now block post Message to localhost/custom domains? Do I need to add something to IFrameCommunicator.html headers or whitelist my site. local somewhere?
Thanks for any quick pointers!
