[Flutter] Flutter / Cloud Messaging notification - the token is undefined when calling...

I call my function when I do an action somewhere in a flutter class. (when a user add a word, I want the partner connected with receive the notification about the new word!) When I print partnerFcmToken, it's well here and working well. Problem is that when I call the function, it always return the token is undefined.

String? partnerFcmToken = userSnap['partner_fcm_token'] as String?;

if (partnerFcmToken != null && partnerFcmToken.isNotEmpty) {
print("Envoie notif fait.");
print(partnerFcmToken);

// Call the cloud function to send the notification
final response = await FirebaseFunctions.instance
.httpsCallable('sendNotificationToPartnerPhoneV2')
.call({
'token_partner': partnerFcmToken,
'lang1': lang1, // Include lang1 in the request
'lang2': lang2, // Include lang2 in the request
});

if (response.data['success']) {
print("Notification sent successfully!");
} else {
print("Failed to send notification: ${response.data['error']}");
}
}


And here is the cloud function called. It return Partner FCM token is invalid or empty.

const functions = require("firebase-functions");
const admin = require("firebase-admin");

admin.initializeApp();

// eslint-disable-next-line max-len
exports.sendNotificationToPartnerPhoneV2 = functions.https.onCall(async (request) => {
console.log("Starting sendNotificationToPartnerPhoneV2 function");

// Retrieve the FCM token from the request
const partnerFcmToken = request.token_partner;

// Validate the FCM token
if (typeof partnerFcmToken !== "string" || partnerFcmToken.trim() === "") {
console.error("Invalid partner FCM token:", partnerFcmToken);
return {success: false, error: "Partner FCM token is invalid or empty."};
}

// Prepare the notification message
const message = {
notification: {
title: "Your partner added a new word!",
// eslint-disable-next-line max-len
body: `${request.lang1} / ${request.lang2}`, // Use template literals for message body
},
token: partnerFcmToken,
};

// Log the message to be sent
console.log("Message to be sent:", JSON.stringify(message, null, 2));

try {
// Send the notification
await admin.messaging().send(message);
console.log("Notification sent successfully.");
return {success: true};
} catch (error) {
console.error("Error sending notification:", error);
return {success: false, error: error.message};
}
});



I guess I call it badly the 'request' or data that I put in parameters of the function, but I have no idea how it works in JS properly.

Thanks already for your help ! MG

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