DEC_V2 - https://docs.sitefinity.com/dec/api-v2/javascript-sdk-capture-client-side-behavior

InitializeInsightSDK.js

function initInsight() {
    var insightClient = new sfDataIntell.Client({
        apiKey: '12345678-1234-1234-1234-1234567890ab', // replace with your Insight data center API key
        apiServerUrl: 'https://api.insight.sitefinity.com', // change this to the API server URL where your Insight account is hosted
        source: 'Website',
        trackPageVisits: true,
        trackBrowserInformation: true,
        trackUtmParameters: true,
        crossDomainTrackingEntries: ["example.org", "example.com"],
        sessionLengthInMinutes: 30,
        trackYouTubeVideos: true,
        trackVimeoVideos: true
    });
}

document.addEventListener('insight-sdk-ready', initInsight);