AuthorizeNetIFrame.onReceiveCommunication not firing on localhost (sandbox) – suddenly stopped work

avalynn — Sat, 22 Nov 2025 08:46:04 GMT

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!

Re: AuthorizeNetIFrame.onReceiveCommunication not firing on localhost (sandbox) – suddenly stopped w

aacampillo — Sun, 07 Dec 2025 17:43:42 GMT

I started getting CSP-related issues in the Sandbox and posted about it here: https://community.developer.cybersource.com/t5/Integration-and-Testing/Accept-Hosted-iFrame-Sandbox-issue-only-Browsers-started/td-p/94677

So we ae dead in the water because we can't change anything about the auth.net form embedded in the iFrame. I also submitted a support ticket. I'm not sure if this is the exact same, but it sounds like it.

topic Re: AuthorizeNetIFrame.onReceiveCommunication not firing on localhost (sandbox) – suddenly stopped w in Integration and Testing

AuthorizeNetIFrame.onReceiveCommunication not firing on localhost (sandbox) – suddenly stopped work

Re: AuthorizeNetIFrame.onReceiveCommunication not firing on localhost (sandbox) – suddenly stopped w