diff --git a/android/src/androidTest/java/com/usercentrics/reactnative/RNUsercentricsModuleTest.kt b/android/src/androidTest/java/com/usercentrics/reactnative/RNUsercentricsModuleTest.kt
index 2db01e8..f0668ae 100644
--- a/android/src/androidTest/java/com/usercentrics/reactnative/RNUsercentricsModuleTest.kt
+++ b/android/src/androidTest/java/com/usercentrics/reactnative/RNUsercentricsModuleTest.kt
@@ -42,6 +42,7 @@ class RNUsercentricsModuleTest {
             putString("version", "1.2.3")
             putInt("networkMode", 1)
             putInt("initTimeoutMillis", 10000)
+            putString("controllerId", "a".repeat(64))
         }
 
         private val bannerSettingsMap = mapOf(
@@ -128,6 +129,7 @@ class RNUsercentricsModuleTest {
         assertEquals("1.2.3", usercentricsProxy.initializeOptionsArgument?.version)
         assertEquals(NetworkMode.EU, usercentricsProxy.initializeOptionsArgument?.networkMode)
         assertEquals(10000L, usercentricsProxy.initializeOptionsArgument?.initTimeoutMillis)
+        assertEquals("a".repeat(64), usercentricsProxy.initializeOptionsArgument?.controllerId)
     }
 
     @Test
diff --git a/android/src/main/java/com/usercentrics/reactnative/extensions/UserOptionsExtensions.kt b/android/src/main/java/com/usercentrics/reactnative/extensions/UserOptionsExtensions.kt
index f4508ac..4ee43e4 100644
--- a/android/src/main/java/com/usercentrics/reactnative/extensions/UserOptionsExtensions.kt
+++ b/android/src/main/java/com/usercentrics/reactnative/extensions/UserOptionsExtensions.kt
@@ -56,6 +56,10 @@ internal fun ReadableMap.usercentricsOptionsFromMap(): UsercentricsOptions {
         options.initTimeoutMillis = it.toLong()
     }
 
+    getString("controllerId")?.let {
+        options.controllerId = it
+    }
+
     getMap("bannerCustomization")?.let {
         options.bannerCustomization = it.bannerInitCustomizationFromMap()
     }
diff --git a/ios/Extensions/UsercentricsOptions+Dict.swift b/ios/Extensions/UsercentricsOptions+Dict.swift
index 42788e2..3102ce2 100644
--- a/ios/Extensions/UsercentricsOptions+Dict.swift
+++ b/ios/Extensions/UsercentricsOptions+Dict.swift
@@ -41,6 +41,10 @@ public extension UsercentricsOptions {
             options.initTimeoutMillis = Int64(initTimeoutMillis)
         }
 
+        if let controllerId = dictionary["controllerId"] as? String {
+            options.controllerId = controllerId
+        }
+
         if let bannerCustomizationDict = dictionary["bannerCustomization"] as? NSDictionary {
             options.bannerCustomization = BannerInitCustomization(from: bannerCustomizationDict)
         }
diff --git a/sample/ios/sampleTests/UsercentricsOptionsDictTests.swift b/sample/ios/sampleTests/UsercentricsOptionsDictTests.swift
index c5ee058..65f36d6 100644
--- a/sample/ios/sampleTests/UsercentricsOptionsDictTests.swift
+++ b/sample/ios/sampleTests/UsercentricsOptionsDictTests.swift
@@ -15,6 +15,7 @@ class UsercentricsOptionsDictTests: XCTestCase {
       "version": "1.2.3",
       "networkMode": 1,
       "initTimeoutMillis": 1500,
+      "controllerId": String(repeating: "a", count: 64),
     ]
 
 
@@ -28,6 +29,7 @@ class UsercentricsOptionsDictTests: XCTestCase {
     XCTAssertEqual(1000, usercentricsOptionsFromDict.timeoutMillis)
     XCTAssertEqual(.eu, usercentricsOptionsFromDict.networkMode)
     XCTAssertEqual(1500, usercentricsOptionsFromDict.initTimeoutMillis)
+    XCTAssertEqual(String(repeating: "a", count: 64), usercentricsOptionsFromDict.controllerId)
   }
 
   func testInitializeWithoutSettingsIdShouldNotInitialize() {
diff --git a/src/__tests__/index.test.ts b/src/__tests__/index.test.ts
index 1430de4..caba82e 100644
--- a/src/__tests__/index.test.ts
+++ b/src/__tests__/index.test.ts
@@ -89,6 +89,21 @@ describe('Test Usercentrics Module', () => {
         expect(call).toBe(options)
     })
 
+    test('testConfigureBridgeWithControllerId', () => {
+        const controllerId = "a".repeat(64);
+        const options = new UsercentricsOptions({
+            settingsId: "abc",
+            ruleSetId: "qwer",
+            controllerId
+        });
+
+        Usercentrics.configure(options);
+        const calls = RNUsercentricsModule.configure.mock.calls;
+        const call = calls[calls.length - 1][0];
+        expect(call).toBe(options);
+        expect(call.controllerId).toBe(controllerId);
+    })
+
     test('testConfigureBridgeWithBannerCustomization', () => {
         const bannerCustomization = new BannerInitCustomization({
             paddingTop: 16,
diff --git a/src/models/UsercentricsOptions.tsx b/src/models/UsercentricsOptions.tsx
index f88855c..276a0d3 100644
--- a/src/models/UsercentricsOptions.tsx
+++ b/src/models/UsercentricsOptions.tsx
@@ -10,6 +10,20 @@ export class UsercentricsOptions {
     networkMode?: NetworkMode;
     consentMediation?: Boolean;
     initTimeoutMillis?: number;
+    /**
+     * Optional controllerId to inject at SDK initialisation.
+     *
+     * Use this to preserve user identity across login/logout flows that clear local consent
+     * storage. Store the controllerId (via `Usercentrics.getControllerId()`) server-side after
+     * the first successful init, then pass it here on every subsequent login. The SDK will skip
+     * generating a new ID and use this value instead. It is persisted to local storage, so
+     * subsequent re-initialisations without this option continue to use it.
+     *
+     * The value must be a 64-character lowercase hexadecimal string (the format produced
+     * internally by the SDK). Invalid values are ignored with a warning log and the SDK falls
+     * back to its normal ID resolution (stored → generated).
+     */
+    controllerId?: string;
     /**
      * @deprecated bannerCustomization is deprecated and will be removed in a future release.
      * Configure banner appearance via the Usercentrics dashboard instead.
@@ -26,6 +40,7 @@ export class UsercentricsOptions {
                     networkMode = undefined,
                     consentMediation = undefined,
                     initTimeoutMillis = undefined,
+                    controllerId = undefined,
                     bannerCustomization = undefined
                 }: {
         settingsId?: string,
@@ -37,6 +52,7 @@ export class UsercentricsOptions {
         networkMode?: NetworkMode,
         consentMediation?: Boolean,
         initTimeoutMillis?: number,
+        controllerId?: string,
         bannerCustomization?: BannerInitCustomization
     }) {
         this.settingsId = settingsId;
@@ -48,6 +64,7 @@ export class UsercentricsOptions {
         this.networkMode = networkMode
         this.consentMediation = consentMediation
         this.initTimeoutMillis = initTimeoutMillis
+        this.controllerId = controllerId
         this.bannerCustomization = bannerCustomization
     }
 }