diff --git a/modules/optidigitalBidAdapter.js b/modules/optidigitalBidAdapter.js
index 9f84ff034ea..489f2c8264c 100755
--- a/modules/optidigitalBidAdapter.js
+++ b/modules/optidigitalBidAdapter.js
@@ -90,6 +90,12 @@ export const spec = {
       payload.uspConsent = bidderRequest.uspConsent;
     }
 
+    if (_getEids(validBidRequests[0])) {
+      payload.user = {
+        eids: _getEids(validBidRequests[0])
+      }
+    }
+
     const payloadObject = JSON.stringify(payload);
     return {
       method: 'POST',
@@ -223,6 +229,12 @@ function _getFloor (bid, sizes, currency) {
   return floor !== null ? floor : bid.params.floor;
 }
 
+function _getEids(bidRequest) {
+  if (deepAccess(bidRequest, 'userIdAsEids')) {
+    return bidRequest.userIdAsEids;
+  }
+}
+
 export function resetSync() {
   isSynced = false;
 }
diff --git a/modules/optidigitalBidAdapter.md b/modules/optidigitalBidAdapter.md
index 466dfb3bef2..327e7a27c75 100755
--- a/modules/optidigitalBidAdapter.md
+++ b/modules/optidigitalBidAdapter.md
@@ -37,10 +37,13 @@ Bidder Adapter for Prebid.js.
 
 ```
 pbjs.setConfig({
-  userSync: {
-    iframeEnabled: true,
-    syncEnabled: true,
-    syncDelay: 3000
-  }
+  userSync: {
+    filterSettings: {
+      iframe: {
+        bidders: '*', // '*' represents all bidders
+        filter: 'include'
+      }
+    }
+  }
 });
 ```
diff --git a/test/spec/modules/optidigitalBidAdapter_spec.js b/test/spec/modules/optidigitalBidAdapter_spec.js
index 62c37f85cc8..30e72452c39 100755
--- a/test/spec/modules/optidigitalBidAdapter_spec.js
+++ b/test/spec/modules/optidigitalBidAdapter_spec.js
@@ -479,6 +479,28 @@ describe('optidigitalAdapterTests', function () {
       expect(payload.imp[0].bidFloor).to.exist;
     });
 
+    it('should add userEids to payload', function() {
+      const userIdAsEids = [{
+        source: 'pubcid.org',
+        uids: [{
+          id: '121213434342343',
+          atype: 1
+        }]
+      }];
+      validBidRequests[0].userIdAsEids = userIdAsEids;
+      bidderRequest.userIdAsEids = userIdAsEids;
+      const request = spec.buildRequests(validBidRequests, bidderRequest);
+      const payload = JSON.parse(request.data);
+      expect(payload.user.eids).to.deep.equal(userIdAsEids);
+    });
+
+    it('should not add userIdAsEids to payload when userIdAsEids is not present', function() {
+      validBidRequests[0].userIdAsEids = undefined;
+      const request = spec.buildRequests(validBidRequests, bidderRequest);
+      const payload = JSON.parse(request.data);
+      expect(payload.user).to.deep.equal(undefined);
+    });
+
     function returnBannerSizes(mediaTypes, expectedSizes) {
       const bidRequest = Object.assign(validBidRequests[0], mediaTypes);
       const request = spec.buildRequests([bidRequest], bidderRequest);