diff --git a/okta_jwt_verifier/jwt_verifier.py b/okta_jwt_verifier/jwt_verifier.py
index d5b36aa..da283af 100644
--- a/okta_jwt_verifier/jwt_verifier.py
+++ b/okta_jwt_verifier/jwt_verifier.py
@@ -133,7 +133,8 @@ async def verify_id_token(self, token, claims_to_verify=('iss', 'exp'), nonce=No
             self.verify_signature(token, okta_jwk)
 
             # verify client_id and nonce
-            self.verify_client_id(claims['aud'])
+            if self.client_id:
+                self.verify_client_id(claims['cid'])
             if 'nonce' in claims and claims['nonce'] != nonce:
                 raise JWTValidationException('Claim "nonce" is invalid.')
         except JWTValidationException:
@@ -141,18 +142,18 @@ async def verify_id_token(self, token, claims_to_verify=('iss', 'exp'), nonce=No
         except Exception as err:
             raise JWTValidationException(str(err))
 
-    def verify_client_id(self, aud):
-        """Verify client_id match aud or one of its elements."""
-        if isinstance(aud, str):
-            if aud != self.client_id:
-                raise JWTValidationException('Claim "aud" does not match Client ID.')
-        elif isinstance(aud, list):
-            for elem in aud:
+    def verify_client_id(self, cid):
+        """Verify client_id match cid or one of its elements."""
+        if isinstance(cid, str):
+            if cid != self.client_id:
+                raise JWTValidationException('Claim "cid" does not match Client ID.')
+        elif isinstance(cid, list):
+            for elem in cid:
                 if elem == self.client_id:
                     return
-            raise JWTValidationException('Claim "aud" does not contain Client ID.')
+            raise JWTValidationException('Claim "cid" does not contain Client ID.')
         else:
-            raise JWTValidationException('Claim "aud" has unsupported format.')
+            raise JWTValidationException('Claim "cid" has unsupported format.')
 
     def verify_signature(self, token, okta_jwk):
         """Verify token signature using received jwk."""
@@ -282,6 +283,7 @@ class AccessTokenVerifier():
     def __init__(self,
                  issuer=None,
                  audience='api://default',
+                 client_id='client_id_stub',
                  request_executor=RequestExecutor,
                  max_retries=MAX_RETRIES,
                  request_timeout=REQUEST_TIMEOUT,
@@ -301,7 +303,7 @@ def __init__(self,
             cache_jwks: bool, optional
         """
         self._jwt_verifier = BaseJWTVerifier(issuer=issuer,
-                                             client_id='client_id_stub',
+                                             client_id=client_id,
                                              audience=audience,
                                              request_executor=request_executor,
                                              max_retries=max_retries,
diff --git a/tests/unit/test_jwt_verifier.py b/tests/unit/test_jwt_verifier.py
index 3693b63..9a0a743 100644
--- a/tests/unit/test_jwt_verifier.py
+++ b/tests/unit/test_jwt_verifier.py
@@ -117,30 +117,30 @@ def test_verify_signature(mocker):
 
 def test_verify_client_id():
     """Check if method verify_client_id works correctly."""
-    # verify when aud is a string
+    # verify when cid is a string
     client_id = 'test_client_id'
-    aud = client_id
+    cid = client_id
     jwt_verifier = BaseJWTVerifier('https://test_issuer.com', client_id)
-    jwt_verifier.verify_client_id(aud)
+    jwt_verifier.verify_client_id(cid)
 
-    # verify when aud is an array
-    aud = ['test_audience', client_id]
-    jwt_verifier.verify_client_id(aud)
+    # verify when cid is an array
+    cid = ['test_cid', client_id]
+    jwt_verifier.verify_client_id(cid)
 
-    # verify exception is raised when aud is a string
+    # verify exception is raised when cid is a string
     with pytest.raises(JWTValidationException):
-        aud = 'bad_aud'
-        jwt_verifier.verify_client_id(aud)
+        cid = 'bad_cid'
+        jwt_verifier.verify_client_id(cid)
 
-    # verify exception is raised when aud is an array
+    # verify exception is raised when cid is an array
     with pytest.raises(JWTValidationException):
-        aud = ['bad_aud']
-        jwt_verifier.verify_client_id(aud)
+        cid = ['bad_cid']
+        jwt_verifier.verify_client_id(cid)
 
-    # verify exception is raised when aud is not a string or array
+    # verify exception is raised when cid is not a string or array
     with pytest.raises(JWTValidationException):
-        aud = {'aud': 'bad_aud'}
-        jwt_verifier.verify_client_id(aud)
+        cid = {'cid': 'bad_cid'}
+        jwt_verifier.verify_client_id(cid)
 
 
 def test_verify_claims():