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To enable the Messaging API, set up the Feature Flag feIntegration.active to value true. In case you are using this Feature Flag feature flag for the first time, please add the following you must add it manually to your CRM config file (described on page /wiki/spaces/UDEV/pages/2235236632), otherwise this setting will not show up on the Feature Flags configuration page:

{
  //...other feature flags,
  "feIntegration": {
    "active": true
  }
}

You can find more details about Feature flags here: /wiki/spaces/UDEV/pages/2235236632.

To call Unity from the external app front-end, use the window.postMessage() method from JavaScript in the browser.

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