Shows the order ID for all DFP-served ads.

show-dfp-order-id.js

(() => {
  const slots = googletag.pubads().getSlots();
  slots.forEach((slot) => {
    const domId = slot.getSlotId().getDomId();
    const campaignId = slot.getResponseInformation().campaignId;
    const element = document.getElementById(domId);
    const campaignSpan = document.createElement('span');
    campaignSpan.innerHTML = campaignId;
    element.parentNode.insertBefore(campaignSpan, element);
  })
})()