diff --git a/modules/improvedigitalBidAdapter.js b/modules/improvedigitalBidAdapter.js
index 3c000258ede..0e2d8f6f7dd 100644
--- a/modules/improvedigitalBidAdapter.js
+++ b/modules/improvedigitalBidAdapter.js
@@ -3,6 +3,7 @@ import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { config } from '../src/config.js';
 import { BANNER, NATIVE, VIDEO } from '../src/mediaTypes.js';
 import {Renderer} from '../src/Renderer.js';
+import { createEidsArray } from './userId/eids.js';
 
 const BIDDER_CODE = 'improvedigital';
 const RENDERER_URL = 'https://acdn.adnxs.com/video/outstream/ANOutstreamVideo.js';
@@ -56,6 +57,13 @@ export const spec = {
 
     requestParameters.schain = bidRequests[0].schain;
 
+    if (bidRequests[0].userId) {
+      const eids = createEidsArray(bidRequests[0].userId);
+      if (eids.length) {
+        utils.deepSetValue(requestParameters, 'user.ext.eids', eids);
+      }
+    }
+
     let requestObj = idClient.createRequest(
       normalizedBids, // requestObject
       requestParameters
@@ -552,6 +560,9 @@ export function ImproveDigitalAdServerJSClient(endPoint) {
     if (requestParameters.schain) {
       impressionBidRequestObject.schain = requestParameters.schain;
     }
+    if (requestParameters.user) {
+      impressionBidRequestObject.user = requestParameters.user;
+    }
     if (extraRequestParameters) {
       for (let prop in extraRequestParameters) {
         impressionBidRequestObject[prop] = extraRequestParameters[prop];
diff --git a/test/spec/modules/improvedigitalBidAdapter_spec.js b/test/spec/modules/improvedigitalBidAdapter_spec.js
index 5a20944a6ed..89ec5aed8c3 100644
--- a/test/spec/modules/improvedigitalBidAdapter_spec.js
+++ b/test/spec/modules/improvedigitalBidAdapter_spec.js
@@ -154,6 +154,8 @@ describe('Improve Digital Adapter Tests', function () {
       expect(params.bid_request.version).to.equal(`${spec.version}-${idClient.CONSTANTS.CLIENT_VERSION}`);
       expect(params.bid_request.gdpr).to.not.exist;
       expect(params.bid_request.us_privacy).to.not.exist;
+      expect(params.bid_request.schain).to.not.exist;
+      expect(params.bid_request.user).to.not.exist;
       expect(params.bid_request.imp).to.deep.equal([
         {
           id: '33e9500b21129f',
@@ -345,6 +347,22 @@ describe('Improve Digital Adapter Tests', function () {
       expect(params.bid_request.schain).to.equal(schain);
     });
 
+    it('should add eids', function () {
+      const userId = { id5id:	{ uid: '1111' } };
+      const expectedUserObject = { ext: { eids: [{
+        source: 'id5-sync.com',
+        uids: [{
+          atype: 1,
+          id: '1111'
+        }]
+      }]}};
+      const bidRequest = Object.assign({}, simpleBidRequest);
+      bidRequest.userId = userId;
+      const request = spec.buildRequests([bidRequest], bidderRequestReferrer)[0];
+      const params = JSON.parse(decodeURIComponent(request.data.substring(PARAM_PREFIX.length)));
+      expect(params.bid_request.user).to.deep.equal(expectedUserObject);
+    });
+
     it('should return 2 requests', function () {
       const requests = spec.buildRequests([
         simpleBidRequest,