How to use the https://github.com/chemerisuk/cordova-plugin-idfa plugin in Ionic v3.

I had some issues using the example provided so I had to call the exec directly:

// first install the plugin
// cordova plugin add cordova-plugin-idfa
// npm i cordova-plugin-idfa --save

// add permissions to config.xml under ios platform
<platform name="ios">
    <edit-config target="NSUserTrackingUsageDescription" file="*-Info.plist" mode="merge">
        <string> My tracking usage description </string>
    </edit-config>
</platform>

// has to be called after platform is ready
// this.platform.ready().then(() => {}

askTrackingPermission() {
    if (this.platform.is('cordova') && this.platform.is('ios')) {

      if (window.cordova) {
        console.log('trying to request permission ');
        window.cordova.exec(win, fail, 'idfa', "requestPermission", []);
      }
    }

    function win(res) {
      console.log('success ' + JSON.stringify(res));
    }
    function fail(res) {
      console.log('fail ' + JSON.stringify(res));
    }
  }

readTrackingPermission() {

    if (this.platform.is('cordova') && this.platform.is('ios')) {

      if (window.cordova) {
        window.cordova.exec(win, fail, 'idfa', "getInfo", []);
      }
    }

    function win(res) {
      console.log('success  ' + JSON.stringify(res));
    }
    function fail(res) {
      console.log('fail ' + JSON.stringify(res));
    }
  }

Also, you can only test this from the iOS simulator (or device) running 14.5.1+ iOS. In your iOS device settings check privacy->tracking (setting) it has to be allowed to ask. And you will only be able to ask the user once.

Good luck!