diff --git a/dart/send_push_notification/README.md b/dart/send_push_notification/README.md
index 314ada6e..4b1f34e8 100644
--- a/dart/send_push_notification/README.md
+++ b/dart/send_push_notification/README.md
@@ -3,7 +3,7 @@
 A Dart Cloud Function that send push notification using FCM to particular user.
 
 * Make sure that you are integrated FCM into your app (Web/Android/Apple/Flutter)
-* Generate needed `FMC_SERVER_KEY` env variable
+* Generate needed `FCM_SERVER_KEY` env variable
 
 ### Hot to get FCM Server Key
 
@@ -50,7 +50,7 @@ _Example output 2:_
 
 List of environment variables used by this cloud function:
 
-* **FMC_SERVER_KEY** - Server Key for FCM settings
+* **FCM_SERVER_KEY** - Server Key for FCM settings
 
 ## 🚀 Deployment
 
@@ -82,7 +82,7 @@ runtime [README](https://github.com/open-runtimes/open-runtimes/tree/main/runtim
 4. Execute function:
 
 ```shell
-curl http://localhost:3000/ -d '{"variables":{"FMC_SERVER_KEY":"YOUR_FMC_SERVER_KEY"},"payload":"{\"user_token\":\"USER_FCM_TOKEN\"}"}' -H "X-Internal-Challenge: secret-key" -H "Content-Type: application/json"
+curl http://localhost:3000/ -d '{"variables":{"FCM_SERVER_KEY":"YOUR_FCM_SERVER_KEY"},"payload":"{\"user_token\":\"USER_FCM_TOKEN\"}"}' -H "X-Internal-Challenge: secret-key" -H "Content-Type: application/json"
 ```
 
 ## 📝 Notes
diff --git a/dart/send_push_notification/lib/main.dart b/dart/send_push_notification/lib/main.dart
index 75e318d6..ecf99626 100644
--- a/dart/send_push_notification/lib/main.dart
+++ b/dart/send_push_notification/lib/main.dart
@@ -16,7 +16,7 @@ void returnFailure(final res, final String message) {
 }
 
 bool checkEnvVariables(final req, final res) {
-  if (req.variables['FMC_SERVER_KEY'] == null) {
+  if (req.variables['FCM_SERVER_KEY'] == null) {
     returnFailure(res, "Some Environment variables are not set");
     return false;
   }
@@ -37,7 +37,7 @@ Future<void> start(final req, final res) async {
   if (!checkEnvVariables(req, res)) {
     return;
   }
-  final String serverKey = req.variables['FMC_SERVER_KEY'];
+  final String serverKey = req.variables['FCM_SERVER_KEY'];
 
   final payload = jsonDecode(req.payload == '' ? '{}' : req.payload);
   if (!checkPayload(payload, res)) {