gistfile1.php

function embed_ambassador_tracking_pixel($order) {
  $email = $order->billing_email; 
  echo '<img src="https://mbsy.co/embed/v2/img/?mbsy_username=AFG&mbsy_campaign_uid=12765&mbsy_email='.$email.'&mbsy_revenue=0&mbsy_has_trial=1&mbsy_auto_create=0" style="border: none; display: none" alt="" />';
  echo '<img src="https://mbsy.co/embed/v2/img/?mbsy_username=AFG&mbsy_campaign_uid=_____&mbsy_email='.$email.'&mbsy_revenue=0&mbsy_has_trial=1&mbsy_auto_create=0" style="border: none; display: none" alt="" />';
}

add_action('woocommerce_order_details_after_customer_details', 'embed_ambassador_tracking_pixel',10, 1);