diff --git a/modules/openPairIdSystem.js b/modules/openPairIdSystem.js
new file mode 100644
index 000000000000..8d104625ca99
--- /dev/null
+++ b/modules/openPairIdSystem.js
@@ -0,0 +1,123 @@
+/**
+ * This module adds PAIR Id to the User ID module
+ * The {@link module:modules/userId} module is required
+ * @module modules/pairIdSystem
+ * @requires module:modules/userId
+ */
+
+import { submodule } from '../src/hook.js';
+import {getStorageManager} from '../src/storageManager.js'
+import { logInfo } from '../src/utils.js';
+import {MODULE_TYPE_UID} from '../src/activities/modules.js';
+import {VENDORLESS_GVLID} from '../src/consentHandler.js';
+
+/**
+ * @typedef {import('../modules/userId/index.js').Submodule} Submodule
+ */
+
+const MODULE_NAME = 'openPairId';
+const PAIR_ID_KEY = 'pairId';
+
+const DEFAULT_STORAGE_PAID_ID_KEYS = {
+  liveramp: '_lr_pairId'
+};
+
+export const storage = getStorageManager({moduleType: MODULE_TYPE_UID, moduleName: MODULE_NAME});
+
+function pairIdFromLocalStorage(key) {
+  return storage.localStorageIsEnabled() ? storage.getDataFromLocalStorage(key) : null;
+}
+
+function pairIdFromCookie(key) {
+  return storage.cookiesAreEnabled() ? storage.getCookie(key) : null;
+}
+
+/** @type {Submodule} */
+export const pairIdSubmodule = {
+  /**
+   * used to link submodule with config
+   * @type {string}
+   */
+  name: MODULE_NAME,
+  /**
+   * used to specify vendor id
+   * @type {number}
+   */
+  gvlid: VENDORLESS_GVLID,
+  /**
+   * decode the stored id value for passing to bid requests
+   * @function
+   * @param { string | undefined } value
+   * @returns {{pairId:string} | undefined }
+   */
+  decode(value) {
+    return value && Array.isArray(value) ? {'pairId': value} : undefined
+  },
+  /**
+   * Performs action to obtain ID and return a value in the callback's response argument.
+   * @function getId
+   * @param {Object} config - The configuration object.
+   * @param {Object} config.params - The parameters from the configuration.
+   * @returns {{id: string[] | undefined}} The obtained IDs or undefined if no IDs are found.
+   */
+  getId(config) {
+    const pairIdsString = pairIdFromLocalStorage(PAIR_ID_KEY) || pairIdFromCookie(PAIR_ID_KEY)
+    let ids = []
+
+    if (pairIdsString && typeof pairIdsString == 'string') {
+      try {
+        ids = ids.concat(JSON.parse(atob(pairIdsString)))
+      } catch (error) {
+        logInfo(error)
+      }
+    }
+
+    const configParams = (config && config.params) ? config.params : {};
+    const cleanRooms = Object.keys(configParams);
+
+    for (let i = 0; i < cleanRooms.length; i++) {
+      const cleanRoom = cleanRooms[i];
+      const cleanRoomParams = configParams[cleanRoom];
+
+      const cleanRoomStorageLocation = cleanRoomParams.storageKey || DEFAULT_STORAGE_PAID_ID_KEYS[cleanRoom];
+      const cleanRoomValue = pairIdFromLocalStorage(cleanRoomStorageLocation) || pairIdFromCookie(cleanRoomStorageLocation);
+
+      if (cleanRoomValue) {
+        try {
+          const parsedValue = atob(cleanRoomValue);
+
+          if (parsedValue) {
+            const obj = JSON.parse(parsedValue);
+
+            if (obj && typeof obj === 'object' && obj.envelope) {
+              ids = ids.concat(obj.envelope);
+            } else {
+              logInfo('Pairid: Parsed object is not valid or does not contain envelope');
+            }
+          } else {
+            logInfo('Pairid: Decoded value is empty');
+          }
+        } catch (error) {
+          logInfo('Pairid: Error parsing JSON: ', error);
+        }
+      } else {
+        logInfo('Pairid: data clean room value for pairId from storage is empty or null');
+      }
+    }
+
+    if (ids.length == 0) {
+      logInfo('PairId not found.')
+      return undefined;
+    }
+
+    return {'id': ids};
+  },
+  eids: {
+    'openPairId': {
+      source: 'pair-protocol.com',
+      atype: 3
+    },
+  }
+};
+
+submodule('userId', pairIdSubmodule);
diff --git a/test/spec/modules/openPairIdSystem_spec.js b/test/spec/modules/openPairIdSystem_spec.js
new file mode 100644
index 000000000000..0f5e9b3c5dc5
--- /dev/null
+++ b/test/spec/modules/openPairIdSystem_spec.js
@@ -0,0 +1,114 @@
+import { storage, pairIdSubmodule } from 'modules/openPairIdSystem.js';
+import * as utils from 'src/utils.js';
+
+describe('openPairId', function () {
+  let sandbox;
+  let logInfoStub;
+
+  beforeEach(() => {
+    sandbox = sinon.sandbox.create();
+    logInfoStub = sandbox.stub(utils, 'logInfo');
+  });
+  afterEach(() => {
+    sandbox.restore();
+  });
+
+  it('should read pairId from specified clean room if configured with storageKey', function() {
+    let pairIds = ['test-pair-id1', 'test-pair-id2', 'test-pair-id3'];
+    sandbox.stub(storage, 'getDataFromLocalStorage').withArgs('habu_pairId_custom').returns(btoa(JSON.stringify({'envelope': pairIds})));
+
+    let id = pairIdSubmodule.getId({
+      params: {
+        habu: {
+          storageKey: 'habu_pairId_custom'
+        }
+      }})
+
+    expect(id).to.be.deep.equal({id: pairIds});
+  })
+
+  it('should read pairID from liveramp with default storageKey and additional clean room with configured storageKey', function() {
+    let getDataStub = sandbox.stub(storage, 'getDataFromLocalStorage');
+    let liveRampPairIds = ['lr-test-pair-id1', 'lr-test-pair-id2', 'lr-test-pair-id3'];
+    getDataStub.withArgs('_lr_pairId').returns(btoa(JSON.stringify({'envelope': liveRampPairIds})));
+
+    let habuPairIds = ['habu-test-pair-id1', 'habu-test-pair-id2', 'habu-test-pair-id3'];
+    getDataStub.withArgs('habu_pairId_custom').returns(btoa(JSON.stringify({'envelope': habuPairIds})));
+
+    let id = pairIdSubmodule.getId({
+      params: {
+        habu: {
+          storageKey: 'habu_pairId_custom'
+        },
+        liveramp: {}
+      }})
+
+    expect(id).to.be.deep.equal({id: habuPairIds.concat(liveRampPairIds)});
+  });
+
+  it('should log an error if no ID is found when getId', function() {
+    pairIdSubmodule.getId({ params: {} });
+    expect(logInfoStub.calledOnce).to.be.true;
+  });
+
+  it('should read pairId from local storage if exists', function() {
+    let pairIds = ['test-pair-id1', 'test-pair-id2', 'test-pair-id3'];
+    sandbox.stub(storage, 'getDataFromLocalStorage').withArgs('pairId').returns(btoa(JSON.stringify(pairIds)));
+
+    let id = pairIdSubmodule.getId({ params: {} });
+    expect(id).to.be.deep.equal({id: pairIds});
+  });
+
+  it('should read pairId from cookie if exists', function() {
+    let pairIds = ['test-pair-id4', 'test-pair-id5', 'test-pair-id6'];
+    sandbox.stub(storage, 'getCookie').withArgs('pairId').returns(btoa(JSON.stringify(pairIds)));
+
+    let id = pairIdSubmodule.getId({ params: {} });
+    expect(id).to.be.deep.equal({id: pairIds});
+  });
+
+  it('should read pairId from default liveramp envelope local storage key if configured', function() {
+    let pairIds = ['test-pair-id1', 'test-pair-id2', 'test-pair-id3'];
+    sandbox.stub(storage, 'getDataFromLocalStorage').withArgs('_lr_pairId').returns(btoa(JSON.stringify({'envelope': pairIds})));
+    let id = pairIdSubmodule.getId({
+      params: {
+        liveramp: {}
+      }})
+    expect(id).to.be.deep.equal({id: pairIds})
+  })
+
+  it('should read pairId from default liveramp envelope cookie entry if configured', function() {
+    let pairIds = ['test-pair-id4', 'test-pair-id5', 'test-pair-id6'];
+    sandbox.stub(storage, 'getDataFromLocalStorage').withArgs('_lr_pairId').returns(btoa(JSON.stringify({'envelope': pairIds})));
+    let id = pairIdSubmodule.getId({
+      params: {
+        liveramp: {}
+      }})
+    expect(id).to.be.deep.equal({id: pairIds})
+  })
+
+  it('should read pairId from specified liveramp envelope cookie entry if configured with storageKey', function() {
+    let pairIds = ['test-pair-id7', 'test-pair-id8', 'test-pair-id9'];
+    sandbox.stub(storage, 'getDataFromLocalStorage').withArgs('lr_pairId_custom').returns(btoa(JSON.stringify({'envelope': pairIds})));
+    let id = pairIdSubmodule.getId({
+      params: {
+        liveramp: {
+          storageKey: 'lr_pairId_custom'
+        }
+      }})
+    expect(id).to.be.deep.equal({id: pairIds})
+  })
+
+  it('should not get data from storage if local storage and cookies are disabled', function () {
+    sandbox.stub(storage, 'localStorageIsEnabled').returns(false);
+    sandbox.stub(storage, 'cookiesAreEnabled').returns(false);
+    let id = pairIdSubmodule.getId({
+      params: {
+        liveramp: {
+          storageKey: 'lr_pairId_custom'
+        }
+      }
+    })
+    expect(id).to.equal(undefined)
+  })
+});