Implementation pattern

this is the recommended implementation pattern for the parent application to handle all postmessage events securely and consistently window\ addeventlistener('message', (event) => { if (event origin !== 'https //your expected origin com') return; switch (event data event) { case 'cr\ invalid token' case 'cr\ invalid domain' redirecttologin(); break; case 'cr\ session expired' refreshsession(); break; case 'cr\ card registration submitted' showloadingindicator(); break; case 'cr\ card registration success' hideloadingindicator(); showsuccessmessage(); break; case 'cr\ card registration error' hideloadingindicator(); showerrormessage(); break; case 'cr\ general error' showgeneralerrormessage(); break; default console warn('unhandled event type ', event data event); } }); security considerations always verify the event origin using event origin to ensure messages are coming from trusted sources avoid executing dynamic code or unsafe actions based on event payloads treat all message data as untrusted input unless validated