Apple provider invalid_client

[juggle-ninja]

When I try to use:
Socialite::driver('apple')->stateless()->user()
inside the callback function, I encounter an error: invalid_client.

The root cause is in the method:
$response = $this->getAccessTokenResponse($this->getCode());
This method makes a Guzzle POST request to the /auth/token endpoint without including the required header 'Content-Type: application/x-www-form-urlencoded'. However, this header is required for the endpoint to process the request correctly.

[xcode-it]

Same issue

Client error: `POST https://appleid.apple.com/auth/token` resulted in a `400 Bad Request` response:

{"error":"invalid_client"}

Also, it should be a GET request but doesn't work with GET request as it shows Method Not allowed

[juggle-ninja]

@xcode-it , my initial assumption was incorrect. In my case, the issue was related to the use of the firebase/php-jwt package, which was generating an invalid JWT token. After switching to the lcobucci/jwt package, the problem was resolved.