diff --git a/common/locales/en/api-v3.json b/common/locales/en/api-v3.json
index f4cfaa5272..06ba7afd75 100644
--- a/common/locales/en/api-v3.json
+++ b/common/locales/en/api-v3.json
@@ -88,5 +88,7 @@
   "questNotPending": "There is no quest to start.",
   "questOrGroupLeaderOnlyStartQuest": "Only the quest leader or group leader can force start the quest",
   "noAdminAccess": "You don't have admin access.",
-  "pageMustBeNumber": "req.query.page must be a number"
+  "pageMustBeNumber": "req.query.page must be a number",
+  "missingUnsubscriptionCode": "Missing unsubscription code.",
+  "userNotFound": "User Not Found"
 }
diff --git a/test/api/v3/integration/unsubscription/POST-paymentId-subscribe-cancel.test.js b/test/api/v3/integration/unsubscription/POST-paymentId-subscribe-cancel.test.js
new file mode 100644
index 0000000000..359c0061df
--- /dev/null
+++ b/test/api/v3/integration/unsubscription/POST-paymentId-subscribe-cancel.test.js
@@ -0,0 +1,68 @@
+import {
+  generateUser,
+  translate as t,
+} from '../../../../helpers/api-v3-integration.helper';
+import { encrypt } from '../../../../../website/src/libs/api-v3/encryption';
+import { v4 as generateUUID } from 'uuid';
+
+describe('GET /unsubscribe', () => {
+  let user;
+  let testEmail = 'test@habitica.com';
+
+  beforeEach(async () => {
+    user = await generateUser();
+  });
+
+  it('return error when code is not provided', async () => {
+    await expect(user.get('/unsubscribe')).to.eventually.be.rejected.and.eql({
+      code: 400,
+      error: 'BadRequest',
+      message: 'Invalid request parameters.',
+    });
+  });
+
+  it('return error when user is not found', async () => {
+    let code = encrypt(JSON.stringify({
+      _id: generateUUID(),
+    }));
+
+    await expect(user.get(`/unsubscribe?code=${code}`)).to.eventually.be.rejected.and.eql({
+      code: 404,
+      error: 'NotFound',
+      message: t('userNotFound'),
+    });
+  });
+
+  it('unsubscribes a user from email notifications', async () => {
+    let code = encrypt(JSON.stringify({
+      _id: user._id,
+      email: user.email,
+    }));
+
+    await user.get(`/unsubscribe?code=${code}`);
+
+    let unsubscribedUser = await user.get('/user');
+
+    expect(unsubscribedUser.preferences.emailNotifications.unsubscribeFromAll).to.be.true;
+  });
+
+  it('unsubscribes an email from notifications', async () => {
+    let code = encrypt(JSON.stringify({
+      email: testEmail,
+    }));
+
+    let unsubscribedMessage = await user.get(`/unsubscribe?code=${code}`);
+
+    expect(unsubscribedMessage).to.equal('<h1>Unsubscribed successfully!</h1> You won\'t receive any other email from Habitica.');
+  });
+
+  it('returns okay when email is already unsubscribed', async () => {
+    let code = encrypt(JSON.stringify({
+      email: testEmail,
+    }));
+
+    let unsubscribedMessage = await user.get(`/unsubscribe?code=${code}`);
+
+    expect(unsubscribedMessage).to.equal('<h1>Unsubscribed successfully!</h1> You won\'t receive any other email from Habitica.');
+  });
+});
diff --git a/website/src/controllers/api-v3/unsubscription.js b/website/src/controllers/api-v3/unsubscription.js
new file mode 100644
index 0000000000..5578cd742f
--- /dev/null
+++ b/website/src/controllers/api-v3/unsubscription.js
@@ -0,0 +1,57 @@
+import { model as User } from '../../models/user';
+import { model as EmailUnsubscription } from '../../models/emailUnsubscription';
+import { decrypt } from '../../libs/api-v3/encryption';
+import {
+  NotFound,
+} from '../../libs/api-v3/errors';
+
+let api = {};
+
+/**
+ * @api {post} /unsubscribe Unsubscribe an email or user from email notifications
+ * @apiVersion 3.0.0
+ * @apiName UnsubscribeEmail
+ * @apiGroup Unsubscribe
+ *
+ * @apiParam {String} code An unsubscription code
+ *
+ * @apiSuccess {String} okRes An message stating the user/email unsubscribed successfully
+ */
+api.unsubscribe = {
+  method: 'GET',
+  url: '/unsubscribe',
+  middlewares: [],
+  async handler (req, res) {
+    req.checkQuery({
+      code: {
+        notEmpty: {errorMessage: res.t('missingUnsubscriptionCode')},
+      },
+    });
+
+    let validationErrors = req.validationErrors();
+    if (validationErrors) throw validationErrors;
+
+    let data = JSON.parse(decrypt(req.query.code));
+
+    if (data._id) {
+      let userUpdated = await User.update(
+        {_id: data._id},
+        { $set: {'preferences.emailNotifications.unsubscribeFromAll': true}}
+      );
+
+      if (userUpdated.nModified !== 1) throw new NotFound(res.t('userNotFound'));
+
+      res.send(`<h1>${res.t('unsubscribedSuccessfully', null, req.language)}</h1> res.t('unsubscribedTextUsers', null, req.language)`);
+    } else {
+      let unsubscribedEmail = await EmailUnsubscription.findOne({email: data.email});
+      let okResponse = `<h1>${res.t('unsubscribedSuccessfully', null, req.language)}</h1> ${res.t('unsubscribedTextOthers', null, req.language)}`;
+      if (unsubscribedEmail) return res.send(okResponse);
+
+      await EmailUnsubscription.create({email: data.email});
+
+      res.send(okResponse);
+    }
+  },
+};
+
+export default api;