diff --git a/src/sentry/sentry_apps/api/serializers/app_platform_event.py b/src/sentry/sentry_apps/api/serializers/app_platform_event.py
index 6e6124e3a53d..b02060242e10 100644
--- a/src/sentry/sentry_apps/api/serializers/app_platform_event.py
+++ b/src/sentry/sentry_apps/api/serializers/app_platform_event.py
@@ -5,9 +5,9 @@
 from typing import Any, TypedDict
 from uuid import uuid4
 
-from sentry.sentry_apps.models.sentry_app import MASKED_VALUE
 from sentry.sentry_apps.models.sentry_app_installation import SentryAppInstallation
 from sentry.sentry_apps.services.app.model import RpcSentryAppInstallation
+from sentry.sentry_apps.utils.headers import mask_header_values, parse_custom_headers
 from sentry.sentry_apps.utils.webhooks import SentryAppActionType, SentryAppResourceType
 from sentry.users.models.user import User
 from sentry.users.services.user import RpcUser
@@ -111,12 +111,7 @@ def sentry_headers(self) -> dict[str, str]:
     @property
     def custom_headers(self) -> dict[str, str]:
         """User-configured headers parsed from the SentryApp's webhook_headers."""
-        headers: dict[str, str] = {}
-        for header in self.install.sentry_app.webhook_headers or []:
-            name, separator, value = header.partition(":")
-            if separator:
-                headers[name.strip()] = value.strip()
-        return headers
+        return parse_custom_headers(self.install.sentry_app.webhook_headers)
 
     @property
     def headers(self) -> dict[str, str]:
@@ -132,7 +127,7 @@ def masked_custom_headers(self) -> dict[str, str]:
         never persisted to the request buffer. The names are kept so the debug UI
         can show which custom headers were sent without leaking the values.
         """
-        return {name: MASKED_VALUE for name in self.custom_headers}
+        return mask_header_values(self.custom_headers)
 
     @property
     def loggable_headers(self) -> dict[str, str]:
diff --git a/src/sentry/sentry_apps/utils/headers.py b/src/sentry/sentry_apps/utils/headers.py
new file mode 100644
index 000000000000..6ec0464363bd
--- /dev/null
+++ b/src/sentry/sentry_apps/utils/headers.py
@@ -0,0 +1,16 @@
+from collections.abc import Mapping, Sequence
+
+from sentry.sentry_apps.models.sentry_app import MASKED_VALUE
+
+
+def parse_custom_headers(webhook_headers: Sequence[str]) -> dict[str, str]:
+    headers: dict[str, str] = {}
+    for header in webhook_headers:
+        name, separator, value = header.partition(":")
+        if separator:
+            headers[name.strip()] = value.strip()
+    return headers
+
+
+def mask_header_values(headers: Mapping[str, str]) -> dict[str, str]:
+    return {name: MASKED_VALUE for name in headers}