WooCommerce Thank you page - Sharesale tracking image

woocommerce-thankyou-sharesale.php

// This code goes in the functions.php file of you're WP theme (child theme)

add_action('woocommerce_thankyou','sls_sharesale_tracking'); // hook for the thank you page

function sls_sharesale_tracking( $order_id ) { // pass in the order id
	$order = new WC_Order( $order_id );
	$currency = $order->get_order_currency();
	$total = $order->get_total();
	$date = $order->order_date;

	echo '<img src="https://shareasale.com/sale.cfm?amount='.$total.'&tracking='.$order_id.'&transtype=sale&merchantID=MERCHANT_ID_GOES_HERE" width="1" height="1">';
}