diff --git a/packages/restapi/src/lib/channels/signature.helpers.ts b/packages/restapi/src/lib/channels/signature.helpers.ts
index fadb4e480..e6513767a 100644
--- a/packages/restapi/src/lib/channels/signature.helpers.ts
+++ b/packages/restapi/src/lib/channels/signature.helpers.ts
@@ -50,6 +50,32 @@ export const getSubscriptionMessageV2 = (
   }
 };
 
+export const getSubscriptionMessageV3 = (
+  channel: string,
+  userAddress: string,
+  action: channelActionType,
+  userSetting?: string | null
+) => {
+  const actionTypeKey =
+    action === 'Unsubscribe' ? 'unsubscriber' : 'subscriber';
+  if (action == 'Subscribe') {
+    return JSON.stringify({
+      channel,
+      [actionTypeKey]: userAddress,
+      action: action,
+      userSetting: userSetting?? '',
+      timestamp: Math.floor(Date.now() / 1000),
+    }, null, 4);
+  } else {
+    return JSON.stringify({
+      channel,
+      [actionTypeKey]: userAddress,
+      action: action,
+      timestamp: Math.floor(Date.now() / 1000),
+    }, null, 4);
+  }
+};
+
 export const getTypeInformation = (action: string) => {
   if (action === 'Subscribe') {
     return {
diff --git a/packages/restapi/src/lib/channels/subscribeV3.ts b/packages/restapi/src/lib/channels/subscribeV3.ts
new file mode 100644
index 000000000..cb40cfa8f
--- /dev/null
+++ b/packages/restapi/src/lib/channels/subscribeV3.ts
@@ -0,0 +1,106 @@
+import { getCAIPAddress, getConfig, getCAIPDetails, Signer } from '../helpers';
+import {
+  getDomainInformation,
+  getTypeInformationV2,
+  getSubscriptionMessageV3,
+} from './signature.helpers';
+import Constants, { ENV } from '../constants';
+import { SignerType } from '../types';
+import { axiosPost } from '../utils/axiosUtil';
+
+export type SubscribeOptionsV2Type = {
+  signer: SignerType;
+  channelAddress: string;
+  userAddress: string;
+  settings?: string | null;
+  verifyingContractAddress?: string;
+  env?: ENV;
+  origin?: string;
+  onSuccess?: () => void;
+  onError?: (err: Error) => void;
+};
+
+export const subscribeV2 = async (options: SubscribeOptionsV2Type) => {
+  const {
+    signer,
+    channelAddress,
+    userAddress,
+    settings = undefined,
+    verifyingContractAddress,
+    env = Constants.ENV.PROD,
+    origin,
+    onSuccess,
+    onError,
+  } = options || {};
+  try {
+    const _channelAddress = await getCAIPAddress(
+      env,
+      channelAddress,
+      'Channel'
+    );
+
+    const channelCAIPDetails = getCAIPDetails(_channelAddress);
+    if (!channelCAIPDetails) throw Error('Invalid Channel CAIP!');
+
+    const chainId = parseInt(channelCAIPDetails.networkId, 10);
+
+    const _userAddress = await getCAIPAddress(env, userAddress, 'User');
+
+    const userCAIPDetails = getCAIPDetails(_userAddress);
+    if (!userCAIPDetails) throw Error('Invalid User CAIP!');
+
+    const { API_BASE_URL, EPNS_COMMUNICATOR_CONTRACT } = getConfig(
+      env,
+      channelCAIPDetails
+    );
+
+    const requestUrl = `${API_BASE_URL}/v1/channels/${_channelAddress}/subscribe`;
+    // get domain information
+    const domainInformation = getDomainInformation(
+      chainId,
+      verifyingContractAddress || EPNS_COMMUNICATOR_CONTRACT
+    );
+
+    // get type information
+    const typeInformation = getTypeInformationV2();
+
+    // get message
+    const messageInformation = {
+      data: getSubscriptionMessageV3(
+        channelCAIPDetails.address,
+        userCAIPDetails.address,
+        'Subscribe',
+        settings
+      ),
+    };
+    // sign a message using EIP712
+    const pushSigner = new Signer(signer);
+    const signature = await pushSigner.signTypedData(
+      domainInformation,
+      typeInformation,
+      messageInformation,
+      'Data'
+    );
+
+    const verificationProof = signature; // might change
+
+    const body = {
+      verificationProof: `eip712v3:${verificationProof}`,
+      message: messageInformation.data,
+      origin: origin
+    };
+
+    const res = await axiosPost(requestUrl, body);
+
+    if (typeof onSuccess === 'function') onSuccess();
+
+    return { status: res.status, message: 'successfully opted into channel' };
+  } catch (err: any) {
+    if (typeof onError === 'function') onError(err as Error);
+
+    return {
+      status: err?.response?.status ?? '',
+      message: err instanceof Error ? err.message : JSON.stringify(err),
+    };
+  }
+};
diff --git a/packages/restapi/src/lib/channels/unsubscribeV3.ts b/packages/restapi/src/lib/channels/unsubscribeV3.ts
new file mode 100644
index 000000000..caf12b8e2
--- /dev/null
+++ b/packages/restapi/src/lib/channels/unsubscribeV3.ts
@@ -0,0 +1,103 @@
+import { getCAIPAddress, getConfig, getCAIPDetails, Signer } from '../helpers';
+import {
+  getDomainInformation,
+  getTypeInformationV2,
+  getSubscriptionMessageV3,
+} from './signature.helpers';
+import Constants, { ENV } from '../constants';
+import { SignerType } from '../types';
+import { axiosPost } from '../utils/axiosUtil';
+
+export type UnSubscribeOptionsV2Type = {
+  signer: SignerType;
+  channelAddress: string;
+  userAddress: string;
+  verifyingContractAddress?: string;
+  env?: ENV;
+  onSuccess?: () => void;
+  onError?: (err: Error) => void;
+};
+
+export const unsubscribeV2 = async (options: UnSubscribeOptionsV2Type) => {
+  const {
+    signer,
+    channelAddress,
+    userAddress,
+    verifyingContractAddress,
+    env = Constants.ENV.PROD,
+    onSuccess,
+    onError,
+  } = options || {};
+
+  try {
+    const _channelAddress = await getCAIPAddress(
+      env,
+      channelAddress,
+      'Channel'
+    );
+
+    const channelCAIPDetails = getCAIPDetails(_channelAddress);
+    if (!channelCAIPDetails) throw Error('Invalid Channel CAIP!');
+
+    const chainId = parseInt(channelCAIPDetails.networkId, 10);
+
+    const _userAddress = await getCAIPAddress(env, userAddress, 'User');
+
+    const userCAIPDetails = getCAIPDetails(_userAddress);
+    if (!userCAIPDetails) throw Error('Invalid User CAIP!');
+
+    const { API_BASE_URL, EPNS_COMMUNICATOR_CONTRACT } = getConfig(
+      env,
+      channelCAIPDetails
+    );
+
+    const requestUrl = `${API_BASE_URL}/v1/channels/${_channelAddress}/unsubscribe`;
+
+    // get domain information
+    const domainInformation = getDomainInformation(
+      chainId,
+      verifyingContractAddress || EPNS_COMMUNICATOR_CONTRACT
+    );
+
+    // get type information
+    const typeInformation = getTypeInformationV2();
+
+    // get message
+    const messageInformation = {
+      data: getSubscriptionMessageV3(
+        channelCAIPDetails.address,
+        userCAIPDetails.address,
+        'Unsubscribe'
+      ),
+    };
+
+    // sign a message using EIP712
+    const pushSigner = new Signer(signer);
+    const signature = await pushSigner.signTypedData(
+      domainInformation,
+      typeInformation,
+      messageInformation,
+      'Data'
+    );
+
+    const verificationProof = signature; // might change
+
+    const body = {
+      verificationProof: `eip712v3:${verificationProof}`,
+      message: messageInformation.data,
+    };
+
+    const res = await axiosPost(requestUrl, body);
+
+    if (typeof onSuccess === 'function') onSuccess();
+
+    return { status: res.status, message: 'successfully opted out channel' };
+  } catch (err: any) {
+    if (typeof onError === 'function') onError(err as Error);
+
+    return {
+      status: err?.response?.status ?? '',
+      message: err instanceof Error ? err.message : JSON.stringify(err),
+    };
+  }
+};