diff --git a/docs/configurations/configure_push_gateway.md b/docs/configurations/configure_push_gateway.md
new file mode 100644
index 0000000000..f7d8f29af1
--- /dev/null
+++ b/docs/configurations/configure_push_gateway.md
@@ -0,0 +1,14 @@
+## Configuration for push gateway
+
+1. get the push gateway url and add the postfix
+```
+{pushGatewayUrl}/_matrix/push/v1/notify
+```
+Fx: `https://sygnal.domain.dev/_matrix/push/v1/notify`
+
+2. build the app with `--dart-define` and the param `PUSH_NOTIFICATIONS_GATEWAY_URL`
+
+Fx:
+```
+flutter build  apk --release --dart-define=PUSH_NOTIFICATIONS_GATEWAY_URL=https://sygnal.domain.dev/_matrix/push/v1/notify
+```
diff --git a/lib/config/app_config.dart b/lib/config/app_config.dart
index fc45d6590d..1bf870c5f7 100644
--- a/lib/config/app_config.dart
+++ b/lib/config/app_config.dart
@@ -106,8 +106,13 @@ abstract class AppConfig {
           ? "app.twake.ios.chat"
           : "app.twake.ios.chat.sandbox"
       : "app.twake.android.chat";
-  static const String pushNotificationsGatewayUrl =
-      'https://sygnal.lin-saas.dev/_matrix/push/v1/notify';
+      
+  static const String _pushNotificationsGatewayUrlEnv = String.fromEnvironment(
+    'PUSH_NOTIFICATIONS_GATEWAY_URL',
+    defaultValue: 'https://sygnal.lin-saas.dev/_matrix/push/v1/notify',
+  );
+  
+  static String pushNotificationsGatewayUrl = _pushNotificationsGatewayUrlEnv;
   static const String pushNotificationsPusherFormat = 'event_id_only';
   static const String emojiFontName = 'Noto Emoji';
   static const String emojiFontUrl =