ga(function (tracker) { // Gets the client ID of the default tracker. var clientId = tracker.get('clientId'); // Gets the Checkfront iframe. var checkfrontIframe = document.getElementById('CHECKFRONT_WIDGET_01').getElementsByTagName('iframe')[0]; // Sends the client ID to the window inside the destination frame, once it's loaded. checkfrontIframe.addEventListener("load", function () { this.contentWindow.postMessage(clientId, ''); }); });

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Booking ID: {$BOOKING_ID}