diff --git a/lib/pxcontext.js b/lib/pxcontext.js
index 9f349f7..242aeb4 100644
--- a/lib/pxcontext.js
+++ b/lib/pxcontext.js
@@ -3,6 +3,7 @@ const { v4: uuidv4 } = require('uuid');
 const { CookieOrigin } = require('./enums/CookieOrigin');
 const pxUtil = require('./pxutil');
 const pxJWT = require('./pxjwt');
+const constants = require('./utils/constants');
 
 class PxContext {
     constructor(config, req, additionalFields) {
@@ -43,7 +44,13 @@ class PxContext {
         } else {
             let cookies = req.cookies;
             if (config.CUSTOM_COOKIE_HEADER && req.headers[config.CUSTOM_COOKIE_HEADER]) {
-                cookies = pxUtil.parseCookieHeader(req.headers[config.CUSTOM_COOKIE_HEADER]);
+                const customCookies = pxUtil.parseCookieHeader(req.headers[config.CUSTOM_COOKIE_HEADER]);
+                if (customCookies) {
+                    const customCookieString = JSON.stringify(customCookies);
+                    const cookiesHeaderString = JSON.stringify(cookies);
+                    const cookiesString = [cookiesHeaderString, customCookieString].filter(Boolean).join(constants.COOKIE_SEPARATOR);
+                    cookies = this.cookieStringToUniqueObject(cookiesString);
+                }
             }
 
             this.requestCookieNames = Object.keys(cookies);
@@ -147,6 +154,19 @@ class PxContext {
         // eslint-disable-next-line eqeqeq
         return (this.pxde && this.pxde['breached_account'] && this.pxdeVerified) != null;
     }
+
+    cookieStringToUniqueObject(cookiesString) {
+        if (!cookiesString) {
+            return {};
+        }
+        const mergedString = this.mergeCookieStrings(cookiesString);
+        return Object.assign({}, ...Object.entries(JSON.parse(mergedString)).map(([key, value]) => ({ [key]: value })));
+    }
+
+    mergeCookieStrings(cookieString) {
+        const [cookiesHeader, customCookies] = cookieString.split(constants.COOKIE_SEPARATOR).map(JSON.parse);
+        return JSON.stringify({ ...cookiesHeader, ...customCookies });
+    }
 }
 
 module.exports = PxContext;
diff --git a/lib/utils/constants.js b/lib/utils/constants.js
index a71e60f..aa8de74 100644
--- a/lib/utils/constants.js
+++ b/lib/utils/constants.js
@@ -34,6 +34,7 @@ const TOKEN_SEPARATOR = '.';
 const APP_USER_ID_FIELD_NAME = 'app_user_id';
 const JWT_ADDITIONAL_FIELDS_FIELD_NAME = 'jwt_additional_fields';
 const CROSS_TAB_SESSION = 'cross_tab_session';
+const COOKIE_SEPARATOR = ';';
 
 module.exports = {
     MILLISECONDS_IN_SECOND,
@@ -64,4 +65,5 @@ module.exports = {
     APP_USER_ID_FIELD_NAME,
     JWT_ADDITIONAL_FIELDS_FIELD_NAME,
     CROSS_TAB_SESSION,
+    COOKIE_SEPARATOR,
 };