WooCommerce
Obter Pixel de Imagem
Integração com WooCommerce
Opção 1 : Plugin do WordPress

Opção 2 : Configuração Personalizada
Conversion Tracking Syntax

Atualizado
<img src="https://example.o18.click/p?mid=000&t=i&gb=1&sale={order_subtotal}" width="0" height="0"> add_action('woocommerce_thankyou', 'custom_track_o18');
function custom_track_o18($order_id)
{
$order_data = wc_get_order($order_id);
$total_amount = $order_data->get_subtotal();
$currency = $order_data->get_currency();
$order_number = str_replace('#', '', $order_data->get_order_number());
echo '<img src="https://[domain]/p?m=[account_id]&t=i&gb=1&sale=' . $total_amount . '&adv_sub1=' . $order_number . '¤cy='. $currency.'" width="0px" height="0px">';
}