add_fb_events_to_event_espresso.php

<?php

/**
 * Code to trigger on every page.
 */
function onPageLoad() {

	?>
		<!-- Facebook Pixel Code -->
		<!-- PageView -->
		<script>
		    !function(f,b,e,v,n,t,s){if(f.fbq)return;n=f.fbq=function(){n.callMethod?
		    n.callMethod.apply(n,arguments):n.queue.push(arguments)};if(!f._fbq)f._fbq=n;
		    n.push=n;n.loaded=!0;n.version='2.0';n.queue=[];t=b.createElement(e);t.async=!0;
		    t.src=v;s=b.getElementsByTagName(e)[0];s.parentNode.insertBefore(t,s)}(window,
		    document,'script','https://connect.facebook.net/en_US/fbevents.js');
		    fbq('init', '<< ADD YOUR FB PIXEL ID HERE >>');
		    fbq('track', 'PageView');
		</script>
		<noscript>
			<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=<< ADD YOUR FB PIXEL ID HERE >>&ev=PageView&noscript=1"/>
		</noscript>
		<!-- End Facebook Pixel Code -->
	<?php
}

add_action('wp_head', 'onPageLoad');



/**
 * Code to trigger on event detail page.
 */
function onEventPageLoad() {

    if (get_post_type() === 'espresso_events') {
        
        $event = EEH_Event_View::get_event();
        #echo '<pre>'; print_r($event); echo '</pre>';
	    
        if(! $event instanceof EE_Event ) {
            return;
        }
	    
        $price = 0;
        foreach ($event->tickets() as $ticket) {
            #echo '<pre> ** TicketID='; print_r($ticket->ID()); echo ', Available='; print_r($ticket->available()); echo ', Price='; print_r($ticket->price()); echo ' ** </pre>';
            #echo '<pre>'; print_r($ticket); echo '</pre>';
            if ($ticket->is_remaining() && !$ticket->is_expired()) {
                $price = $ticket->price();
                #echo '<pre>Price='; print_r($price); echo '</pre>';
                break;
            }
        }
	    
	?>
		<!-- Facebook Pixel Code -->
		<script>
		     fbq('track', 'ViewContent', {
			    value: <?php echo $price ?>, 
			    currency: 'GBP',
			    content_name: '<?php echo $event->name(); ?>',
			    content_type: 'product', // Required for Dynamic Product Ads
			    content_ids: '<?php echo $event->ID(); ?>' //Required for Dynamic Product Ads -> Event Espresso Post ID
		     });
		</script>
		<!-- End Facebook Pixel Code -->
	<?php
	}

}
add_action('wp_head', 'onEventPageLoad');



/**
 * Code to trigger on event registration page.
 */
function onEventInitiateCheckout(){

	if (is_page('registration-checkout')) {

        $checkout = EE_Registry::instance()->SSN->checkout();
	    
        if ( $checkout instanceof EE_Checkout ) {
            
            $transaction = $checkout->transaction;

            if ( $transaction instanceof EE_Transaction ) {
		    
		        #echo '<pre>** TRANSACTION **</pre>';
                #echo '<pre>'; print_r($transaction); echo '</pre>';                           
                #echo '<pre> TRANSACTION TOTAL='; print_r($transaction->total()); echo '</pre>';
		    
                foreach ( $transaction->registrations() as $registration ) {
                    if ( $registration instanceof EE_Registration ) {
                        $event = $registration->event();
                        if ( $event instanceof EE_Event ) {
                            $event_id = $event->ID();
                            $event_slug = $event->get(EVT_slug);
                            #echo '<pre> EventId='; print_r($event_id); echo '</pre>';
                        }
                    }
                }   
            }
        }

	?>
		<!-- Facebook Pixel Code -->
		<script>
		     fbq('track', 'InitiateCheckout', {
			    value: <?php echo $transaction->total() ?>, 
			    currency: 'GBP',
			    content_name: '<?php echo $event_slug; ?>',
			    content_category: 'Checkout',
			    content_type: 'product', // Required for Dynamic Product Ads
			    content_ids: '<?php echo $event_id; ?>', //Required for Dynamic Product Ads -> dynamic espresso event id
			    num_ids: <?php echo count($transaction->registrations()); ?> //Number of espresso tickets bought
		     });
		</script>
		<!-- End Facebook Pixel Code -->
	<?php
    }
}

add_action('wp_head', 'onEventInitiateCheckout');



/**
 * Code to trigger on checkout thank you page.
 */
function onEventCheckout() {

    $pagename = get_query_var('pagename');
    #echo "page name = "; echo $pagename;

    if ($pagename == 'thank-you') {

    	$transaction = EE_Registry::instance()->load_model('Transaction')->get_transaction_from_reg_url_link();

    	if (!$transaction instanceof EE_Transaction) {
	        exit();
	    }

	    $registrations = $transaction->registrations();

	    foreach ($registrations as $key => $registration) {

	        if ($_REQUEST['e_reg_url_link'] == $registration->reg_url_link()) {

                // DEBUG
		        #echo '<pre>'; print_r($registration); echo '</pre>';

                $event = $registration->event();
                if ( $event instanceof EE_Event ) {
                    $event_id = $event->ID();
                    $event_slug = $event->get(EVT_slug);
                    #echo '<pre> EventId='; print_r($event_id); echo '</pre>';
                }

                //FB Tracking Code
                ?>
                    <script>
                        fbq('track', 'Purchase', {
                            value: <?php echo $registration->price_paid( ); ?>,
                            currency: 'GBP',
                            content_name: '<?php echo $event_slug; ?>', // Dynamic event name
                            content_type: 'product', // Required for Dynamic Product Ads
                            content_ids: '<?php echo $event_id; ?>', // Required for Dynamic Product Ads -> dynamic espresso event id
                            num_ids: <?php echo count($transaction->registrations()); ?> //Number of espresso tickets bought
                        });
                    </script>

                <?php
            }
        }
    }
}

add_action( 'wp_head', 'onEventCheckout' );