diff --git a/src/blueink/client.py b/src/blueink/client.py
index fea0dc8..6b85fb5 100644
--- a/src/blueink/client.py
+++ b/src/blueink/client.py
@@ -19,6 +19,7 @@ def __init__(
         private_api_key: str = None,
         base_url: str = None,
         raise_exceptions: bool = True,
+        security_headers: dict = None,
     ):
         """Initialize a Client instance to access the Blueink eSignature API
 
@@ -29,6 +30,7 @@ def __init__(
             base_url: override the API base URL. If not supplied, we check the
                 environment variable BLUEINK_API_URL. If that is empty, the default
                 value of "https://api.blueink.com/api/v2" is used.
+            security_headers: Place for additional security headers, likely unnecessary
             raise_exceptions (Default True): raise HTTPError if code != 200. Otherwise
             return as NormalizedResponse objects.
 
@@ -44,9 +46,9 @@ def __init__(
 
         if not private_api_key:
             raise ValueError(
-                "A Blueink Private API Key must be provided on Client initialization"
-                " or specified via the environment variable"
-                " {ENV_BLUEINK_PRIVATE_API_KEY}"
+                f"A Blueink Private API Key must be provided on Client initialization"
+                f" or specified via the environment variable"
+                f" {ENV_BLUEINK_PRIVATE_API_KEY}"
             )
 
         if not base_url:
@@ -57,7 +59,11 @@ def __init__(
 
         self._base_url = base_url
 
-        self._request_helper = RequestHelper(private_api_key, raise_exceptions)
+        self._request_helper = RequestHelper(
+            private_api_key,
+            raise_exceptions,
+            security_headers=security_headers,
+        )
 
         self.bundles = BundleSubClient(self._base_url, self._request_helper)
         self.persons = PersonSubClient(self._base_url, self._request_helper)
diff --git a/src/blueink/request_helper.py b/src/blueink/request_helper.py
index f9843da..8dc7cf6 100644
--- a/src/blueink/request_helper.py
+++ b/src/blueink/request_helper.py
@@ -1,6 +1,5 @@
 import requests
 from munch import munchify
-from requests import Request, Session
 
 from blueink.constants import BLUEINK_PAGINATION_HEADER
 
@@ -55,9 +54,13 @@ def __init__(self, response: requests.Response):
 
 
 class RequestHelper:
-    def __init__(self, private_api_key, raise_exceptions=False):
+    def __init__(
+        self, private_api_key, raise_exceptions=False, security_headers: dict = None
+    ):
+
         self._private_api_key = private_api_key
         self._raise_exceptions = raise_exceptions
+        self._security_headers = security_headers
 
     def delete(self, url, **kwargs):
         return self._make_request("delete", url, **kwargs)
@@ -88,6 +91,9 @@ def _build_headers(self, content_type=None, more_headers=None):
         if more_headers:
             hdrs.update(more_headers)
 
+        if self._security_headers:
+            hdrs.update(self._security_headers)
+
         hdrs["Authorization"] = f"Token {self._private_api_key}"
 
         if content_type is not None:
@@ -120,6 +126,6 @@ def _make_request(
         )
 
         if self._raise_exceptions:
-            # print(response.content)
             response.raise_for_status()
+
         return NormalizedResponse(response)
diff --git a/src/blueink/subclients/template.py b/src/blueink/subclients/template.py
index 0613b9a..7e4ce06 100644
--- a/src/blueink/subclients/template.py
+++ b/src/blueink/subclients/template.py
@@ -5,9 +5,6 @@
 
 
 class TemplateSubClient(SubClient):
-    def __init__(self, base_url, private_api_key):
-        super().__init__(base_url, private_api_key)
-
     def paged_list(
         self, page: int = 1, per_page: int = 50, **query_params
     ) -> PaginatedIterator:
diff --git a/src/blueink/subclients/webhook.py b/src/blueink/subclients/webhook.py
index 1adac16..ca0edc0 100644
--- a/src/blueink/subclients/webhook.py
+++ b/src/blueink/subclients/webhook.py
@@ -4,9 +4,6 @@
 
 
 class WebhookSubClient(SubClient):
-    def __init__(self, base_url, private_api_key):
-        super().__init__(base_url, private_api_key)
-
     # ----------
     # Webhooks
     # ----------