diff --git a/.env.development b/.env.development
index 40b221fe..d30eedef 100644
--- a/.env.development
+++ b/.env.development
@@ -18,4 +18,6 @@ VITE_DEFAULT_ENDORSER_API_SERVER=http://localhost:3000
 VITE_DEFAULT_IMAGE_API_SERVER=https://test-image-api.timesafari.app
 VITE_DEFAULT_PARTNER_API_SERVER=http://localhost:3000
 #VITE_DEFAULT_PUSH_SERVER... can't be set up with localhost domain
+# Using shared test notify API (no local notify server by default).
+VITE_DEFAULT_NOTIFY_API_SERVER=https://test-notify-api.timesafari.app
 VITE_PASSKEYS_ENABLED=true
diff --git a/.env.production b/.env.production
index aef4d6a4..2a92d953 100644
--- a/.env.production
+++ b/.env.production
@@ -11,3 +11,4 @@ VITE_DEFAULT_ENDORSER_API_SERVER=https://api.endorser.ch
 VITE_DEFAULT_IMAGE_API_SERVER=https://image-api.timesafari.app
 VITE_DEFAULT_PARTNER_API_SERVER=https://partner-api.endorser.ch
 VITE_DEFAULT_PUSH_SERVER=https://timesafari.app
+VITE_DEFAULT_NOTIFY_API_SERVER=https://notify-api.timesafari.app
diff --git a/.env.test b/.env.test
index dd3d755c..19e23299 100644
--- a/.env.test
+++ b/.env.test
@@ -15,4 +15,5 @@ VITE_DEFAULT_ENDORSER_API_SERVER=https://test-api.endorser.ch
 VITE_DEFAULT_IMAGE_API_SERVER=https://test-image-api.timesafari.app
 VITE_DEFAULT_PARTNER_API_SERVER=https://test-partner-api.endorser.ch
 VITE_DEFAULT_PUSH_SERVER=https://test.timesafari.app
+VITE_DEFAULT_NOTIFY_API_SERVER=https://test-notify-api.timesafari.app
 VITE_PASSKEYS_ENABLED=true
diff --git a/src/constants/app.ts b/src/constants/app.ts
index a309902b..020709fc 100644
--- a/src/constants/app.ts
+++ b/src/constants/app.ts
@@ -26,6 +26,9 @@ export enum AppString {
   TEST1_PUSH_SERVER = "https://test.timesafari.app",
   TEST2_PUSH_SERVER = "https://timesafari-pwa.anomalistlabs.com",
 
+  PROD_NOTIFY_API_SERVER = "https://notify-api.timesafari.app",
+  TEST_NOTIFY_API_SERVER = "https://test-notify-api.timesafari.app",
+
   NO_CONTACT_NAME = "(no name)",
 }
 
@@ -47,8 +50,6 @@ export const DEFAULT_PARTNER_API_SERVER =
 export const DEFAULT_PUSH_SERVER =
   import.meta.env.VITE_DEFAULT_PUSH_SERVER || AppString.PROD_PUSH_SERVER;
 
-export const IMAGE_TYPE_PROFILE = "profile";
-
 /**
  * True when the current API server is not production (test/local build).
  * Use this to show dev/test-only UI (e.g. 10-minute rollover toggle, test user mnemonic).
@@ -56,6 +57,27 @@ export const IMAGE_TYPE_PROFILE = "profile";
 export function isNotProdServer(apiServer: string): boolean {
   return apiServer !== AppString.PROD_ENDORSER_API_SERVER;
 }
+
+/**
+ * Default Notification API base URL for the given Endorser API server.
+ * Prefers VITE_DEFAULT_NOTIFY_API_SERVER when set; otherwise prod vs test/local
+ * follows the same isNotProdServer logic used elsewhere.
+ */
+export function getDefaultNotifyApiServer(apiServer: string): string {
+  return (
+    import.meta.env.VITE_DEFAULT_NOTIFY_API_SERVER ||
+    (isNotProdServer(apiServer)
+      ? AppString.TEST_NOTIFY_API_SERVER
+      : AppString.PROD_NOTIFY_API_SERVER)
+  );
+}
+
+export const DEFAULT_NOTIFY_API_SERVER = getDefaultNotifyApiServer(
+  DEFAULT_ENDORSER_API_SERVER,
+);
+
+export const IMAGE_TYPE_PROFILE = "profile";
+
 export const SUPPORT_EMAIL = "info@TimeSafari.app";
 
 export const PASSKEYS_ENABLED =