diff --git a/parsedmarc/webhook.py b/parsedmarc/webhook.py
index 205407d..982808a 100644
--- a/parsedmarc/webhook.py
+++ b/parsedmarc/webhook.py
@@ -1,3 +1,11 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+
+from typing import Any, Optional, Union
+
+from collections import OrderedDict
+
 import requests
 
 from parsedmarc import logger
@@ -7,7 +15,13 @@ from parsedmarc.constants import USER_AGENT
 class WebhookClient(object):
     """A client for webhooks"""
 
-    def __init__(self, aggregate_url, forensic_url, smtp_tls_url, timeout=60):
+    def __init__(
+        self,
+        aggregate_url: str,
+        forensic_url: str,
+        smtp_tls_url: str,
+        timeout: Optional[int] = 60,
+    ):
         """
         Initializes the WebhookClient
         Args:
@@ -26,25 +40,27 @@ class WebhookClient(object):
             "Content-Type": "application/json",
         }
 
-    def save_forensic_report_to_webhook(self, report):
+    def save_forensic_report_to_webhook(self, report: OrderedDict[str, Any]):
         try:
             self._send_to_webhook(self.forensic_url, report)
         except Exception as error_:
             logger.error("Webhook Error: {0}".format(error_.__str__()))
 
-    def save_smtp_tls_report_to_webhook(self, report):
+    def save_smtp_tls_report_to_webhook(self, report: OrderedDict[str, Any]):
         try:
             self._send_to_webhook(self.smtp_tls_url, report)
         except Exception as error_:
             logger.error("Webhook Error: {0}".format(error_.__str__()))
 
-    def save_aggregate_report_to_webhook(self, report):
+    def save_aggregate_report_to_webhook(self, report: OrderedDict[str, Any]):
         try:
             self._send_to_webhook(self.aggregate_url, report)
         except Exception as error_:
             logger.error("Webhook Error: {0}".format(error_.__str__()))
 
-    def _send_to_webhook(self, webhook_url, payload):
+    def _send_to_webhook(
+        self, webhook_url: str, payload: Union[bytes, str, dict[str, Any]]
+    ):
         try:
             self.session.post(webhook_url, data=payload, timeout=self.timeout)
         except Exception as error_: