Track Contact Form 7 submissions events in WordPress and send it to Google Analytics

trackCf7Submissions.php

<?php
/**
 * @desc CF7 submission tracking. Trigger ga_send (Google Analytics events tracking) when submitting CF7 form.
 * @return void
 */
function trackCf7Submissions()
{
?>
    <script>
	//get current languages if necessary
	var current_language = document.documentElement.lang;
		
	// set parameters here : 
	var params = [
		{
			"form_id" : 1264,
			"action" : "envoi_formulaire_avis"
		},
		{
			"form_id" : 2030,
			"action" : "envoi_formulaire_rappel"
		},
		{
			"form_id" : 53,
			"action" : "envoi_formulaire_contact"
		},
		{
			"form_id" : 2031,
			"action" : "envoi_formulaire_documentation"
		}
	];

	/**
	* @desc add event listener on CF7 submission. See https://contactform7.com/dom-events/ for more details
	**/
        document.addEventListener( 'wpcf7mailsent', function( event ) {
		   
		for( var i=0; i<params.length; i++){
			if(event.detail.contactFormId == params[i].form_id){
				action = params[i].action;
			}
		}

            
            ga('send', 'event', 'prospect', action);
        }, false );
        </script>
<?php
}
add_action('wp_head', 'trackCf7Submissions');