diff --git a/__tests__/generateAccessToken.test.ts b/__tests__/generateAccessToken.test.ts
new file mode 100644
index 0000000..44b1bd4
--- /dev/null
+++ b/__tests__/generateAccessToken.test.ts
@@ -0,0 +1,40 @@
+import { generateAccessToken } from '../src/promo-node-utils';
+jest.setTimeout(40000);
+
+describe('generateAccessToken no sub', () => {
+  const clientSecret = 'test client secret'; // never do this in your client side js but this is safe due to it being a testing application alone
+  const appId = 'test app id';
+  const clientId = 'test client id';
+  const hostName = 'http://localhost:3000';
+  let accessTokenSigned: string = generateAccessToken(
+    hostName,
+    clientId,
+    appId,
+    clientSecret
+  );
+
+  it('returns a string', async () => {
+    expect(typeof accessTokenSigned).toBe('string');
+  });
+});
+
+describe('generateAccessToken with sub and expiration', () => {
+  const clientSecret = 'test client secret'; // never do this in your client side js but this is safe due to it being a testing application alone
+  const appId = 'test app id';
+  const clientId = 'test client id';
+  const hostName = 'http://localhost:3000';
+  const sub = 'test@tincre.com';
+  const expiration = 123456
+  let accessTokenSigned: string = generateAccessToken(
+    hostName,
+    clientId,
+    appId,
+    clientSecret,
+    expiration,
+    sub
+  );
+
+  it('returns a string', async () => {
+    expect(typeof accessTokenSigned).toBe('string');
+  });
+});
diff --git a/__tests__/getToken.test.ts b/__tests__/getToken.test.ts
index 5ea7023..e49054d 100644
--- a/__tests__/getToken.test.ts
+++ b/__tests__/getToken.test.ts
@@ -1,17 +1,17 @@
 import { getToken } from '../src/.';
-import { generateAccessToken } from './test-utils';
+import { generateAccessToken } from '../src/promo-node-utils';
 jest.setTimeout(40000);
 
 describe('getToken', () => {
   const clientSecret = '57hMbxBuIsWAMiT4k0XZ0JmQV5M0BrpR6E4nN9vbEoWvNy5S'; // never do this in your client side js but this is safe due to it being a testing application alone
-  const appId = 'ygzRl6CiiUivwsNn3UjntatUDP4k'
-  const clientId = 'm4MohkXSo2xMVWYXj6NecyS5uEeJ'
-  const hostName = 'http://localhost:3000'
+  const appId = 'ygzRl6CiiUivwsNn3UjntatUDP4k';
+  const clientId = 'm4MohkXSo2xMVWYXj6NecyS5uEeJ';
+  const hostName = 'http://localhost:3000';
   let accessTokenSigned: string = generateAccessToken(
     hostName,
     clientId,
     appId,
-    clientSecret,
+    clientSecret
   );
 
   it('returns a string', async () => {
diff --git a/src/promo-node-utils.ts b/src/promo-node-utils.ts
index b810c60..d58387a 100644
--- a/src/promo-node-utils.ts
+++ b/src/promo-node-utils.ts
@@ -49,12 +49,13 @@ function generateAccessToken(
   clientId: string,
   appId: string,
   clientSecret: string,
-  expiration?: number
+  expiration?: number,
+  sub?: string
 ) {
   const timestamp = Date.now();
   const exp = expiration ? timestamp + expiration : timestamp + 1800;
   let accessToken: PromoAccessTokenJwt = {
-    sub: '',
+    sub: sub || '',
     iss: issuer,
     cid: clientId,
     aid: appId,