Error 400: Signed data extraction has failed when try to get access token using authorization code

[nehalvadariya77]

I have used below function for authorization:

 public function authorize()
    {
        $connection = new Connection();
        $connection->setRedirectUrl(env("EXACT_CALLBACK_URL"));
        $connection->setExactClientId(env("EXACT_CLIENT_ID"));
        $connection->setExactClientSecret(env("EXACT_CLIENT_SECRET"));
        $connection->redirectForAuthorization();
    }

After getting authorization code below function used to get code:

if (isset($_GET['code']) && is_null(getValue('authorizationcode'))) {
      setValue('authorizationcode', $_GET['code']);
      $request->session()->put('authorizationcode',$_GET['code']);
}
// If we do not have a authorization code, authorize first to setup tokens
   if (!$request->session()->has('authorizationcode')) {
       $exact = new \App\Http\Controllers\ExactOnlineController();
       $exact->authorize();
}

Then I have used below connect function to get access token using authorization code:

 public function connect($request)
    {
        $connection = new \Picqer\Financials\Exact\Connection();
        $connection->setRedirectUrl(env("EXACT_CALLBACK_URL"));
        $connection->setExactClientId(env("EXACT_CLIENT_ID"));
        $connection->setExactClientSecret(env("EXACT_CLIENT_SECRET"));
    
        // Retrieves authorizationcode from database
        if ($request->session()->has('authorizationcode')) {
            $connection->setAuthorizationCode($request->session()->get('authorizationcode'));
        }
    
        // Retrieves accesstoken from database
        if (getValue('accesstoken')) {
            $connection->setAccessToken(getValue('accesstoken'));
        }
    
        // Retrieves refreshtoken from database
        if (getValue('refreshtoken')) {
            $connection->setRefreshToken(getValue('refreshtoken'));
        }
    
        // Retrieves expires timestamp from database
        if (getValue('expires_in')) {
            $connection->setTokenExpires(getValue('expires_in'));
        }

        // Set callback to save newly generated tokens
        $connection->setTokenUpdateCallback('tokenUpdateCallback');
        // Make the client connect and exxchange tokens
        try {
            $connection->connect();
        } catch (\Exception $e) {
            throw new Exception('Could not connect to Exact: ' . $e->getMessage());
        }
    
        return $connection;
    }

It's return below error: Invalid_request and message as 'Signed data extraction has failed'.

I'm not able to do first time connection. I have created one testing app on app center and using it's client_id, client_secret and redirect_uri. (I haven't published this test app yet just trying to connect with it.)

I have tried same API call in postman also and getting same error.

Let me know if I missed any configuration for app or mistake in connect function.

[remkobrenters]

I noticed you are sending the request to exactonline.com while the code seems to be generated through exactonline.nl. Are you sure you are not mixing up things?