Use OnePlan

Follow all of the steps in Create an Analytics account.

Follow all of the steps in Create a new Google Analytics 4 property.

Follow the first two steps in Add a data stream. Then expand the Web section and follow the instructions.

Under Set up data collection for websites, follow the instructions in the Find your "G-" ID (for any platform that accepts a "G-" ID) section. Copy your "G-" ID (Google Tag ID) and save it for use later in these instructions.

In OnePlan, click on the Settings gear to access the Config pages.

Go to General > Advanced. Ensure the Enable Customizations checkbox is checked.

Copy the following JavaScript script:

var tag = 'YOUR_GOOGLE_TAG_ID_HERE';

function addScript( src ) {    
return new Promise( ( resolve, reject ) => {
        const scriptElement = document.createElement( 'script' );
        scriptElement.setAttribute( 'src', src );
        scriptElement.setAttribute( 'async', "" );
        scriptElement.addEventListener( 'load', resolve );
        scriptElement.addEventListener( 'error', reject );
        document.body.appendChild( scriptElement );
    } );
}
try {
    addScript( `https://www.googletagmanager.com/gtag/js?id=${tag}` ).then( ( data ) => {} ).catch( ( e ) => {
        console.log( e );
    } );    window.dataLayer = window.dataLayer || [];
    
    function gtag() {
        dataLayer.push( arguments );
    }
    gtag( 'js', new Date() );
    gtag( 'config', tag );
} catch ( e ) {
    console.log( e );
}

Go to '[my/ca/au/eu].oneplan.ai/config/js'. Paste the code into the Custom JavaScript form.

Replace YOUR_GOOGLE_TAG_ID_HERE with your Google Tag ID that you got from the previous section.

Click Save.