Adobe Launch / Adobe Experience Cloud ID Service (ECID) extension: Append Experience Cloud IDs (visitor IDs) to cross-domain links using appendVisitorIDsTo().

adobe-launch-experience-cloud-id-service-rule-action-append-visitor-ids-to-cross-domain-links.js

/**
 * Dependencies:
 *
 * Data elements:
 * Experience Cloud ID Service visitor instance
 * - extension: Core
 * - data element type: Custom Code
 *
 * URL hostname: 
 * - extension: Core
 * - data element type: Page Info
 * - attribute: Hostname
 *
 */

let hostname = _satellite.getVar('URL hostname');
if (/currentdomain\.com$/.test(hostname)) {
  let visitor = _satellite.getVar('Experience Cloud ID Service visitor instance');
  let crossDomainLinks = document.querySelectorAll('a[href*="crossdomain.com"]');
  crossDomainLinks.forEach((crossDomainLink) => {
    let crossDomainLinkHref = crossDomainLink.href;
    let crossDomainLinkHrefWithVisitorIds = visitor.appendVisitorIDsTo(crossDomainLinkHref);
    crossDomainLink.href = crossDomainLinkHrefWithVisitorIds;
  });
}

experience-cloud-id-service-visitor-instance-data-element.js

if (Visitor) {
  let orgId = _satellite.company.orgId;
  let trackingServers = {
    trackingServer: 'metrics.trackingserver.com',
    trackingServerSecure: 'smetrics.trackingserver.com',
    marketingCloudServer: 'metrics.trackingserver.com',
    marketingCloudServerSecure: 'smetrics.trackingserver.com',
  };
  return Visitor.getInstance(orgId, trackingServers);
}