invalid_grant issues on Lumen

[wienzzz]

Can anyone give me pointer about this?

I am trying to incorporate firebase on my Lumen REST API and I have followed the documentation to send FCM using this library, but upon calling the function to send message from code block below :

$topic = "a-topic";
$notification = Notification::create("New ORDER from SALES", "NEW ORDER FROM ".$uid."!");

$message = CloudMessage::withTarget('topic', $topic)
                    ->withNotification($notification) // optional
                    ->withData(array("invoice" => $inv)) // optional
;

$messaging->send($message);

Summary of what I did :

1. composer require kreait/laravel-firebase
2. Generate private key from firebase console and put it on accessible folder
3. create [lumen_project]/config/firebase.php file
4. add FIREBASE_CREDENTIAL to .env file

From here I stuck and don't really know what to do :( Am I missing any step to use laravel-firebase library?

[jeromegamez]

Have you added the ServiceProvider to `config/app.php? (https://github.com/kreait/laravel-firebase#laravel)

It could be that you have local google application default credentials in your $HOME/.config/gcloud directory, e.g. from a previous gcloud auth application-default login operation (or in $APPDATA, if you're on windows). If that's the case, the reason could be that the package is falling back to these credentials when the path specified in FIREBASE_CREDENTIAL cannot be found.

Now that I've written out the FIREBASE_CREDENTIAL myself... the environment variable needs to be FIREBASE_CREDENTIALS (with an S at the end). When the correct env variable is not set, the package will fall back to the auto-discovered application default credentials, so now I believe that this should be in fact the reason 🤞

[wienzzz]

@jeromegamez thanks for your reply,

Your library indeed work out of the box perfectly. Apparently I have several issues that doesn't concern this library at all. But I will share this in case other face similar problem like me :

• since my dev server use proxy to connect to internet, apparently there is some problem within my network upon calling Google OAuth. Just make sure that you can connect to API and clear any cache if necessary.. AND
• Make sure time is in sync. In my case, my server time is around 10 minutes faster than Google time so the connection always return error Thanks for this great library @jeromegamez

[jeromegamez]

Thanks for sharing @wienzzz! 🌺

FYI: You can configure the SDK to use a proxy: https://firebase-php.readthedocs.io/en/5.x/setup.html?highlight=Proxy#http-client-options