When using the explicit oath authentication for stack apps, I have problem receiving the access_token. A user goes to /approve and is then forwarded to approve the app. When redirected back to my site I catch the code parameter and do the final POST to get the access_token. However I cant find it in the response object!

This is my php routes file:

    use GuzzleHttp\Client;

    Route::get('/approve', function () {
        header('Location: https://stackexchange.com/oauth?client_id=12345&scope=write_access&redirect_uri=https://mysite.com/approved');
    });

    Route::get('/approved', function (Request $request) {
        $client = new Client();    
        $response = $client->request('POST', 'https://stackexchange.com/oauth/access_token/json', [
            'form_params' => [
                'client_id' => 12345,
                'client_secret' => 'apfeusenfpuansefpunapfn((',
                'code' => \Request::get("code"),
                'redirect_uri' => 'https://mysite.com/approved'
            ]
        ]);

        dd($response); // dumping the response gives no trace of access_token
    });

* Running getStatusCode() on the response object gives a 200 All ok.
* Dumping the full response, body, or headers give me no reference of the access_token whatsoever.
* I tried swapping "form_params" to "query" same result. 
* Adding "json" to the API URL gives no change.
* I'm using Guzzle 6

Any ideas, where did I go wrong?


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Update: I managed to get the access_token with cURL so I am assuming I am not using guzzle correctly... 

    function RequestToken($code)
    {
        $params = array(
            "code" => $code,
            "client_id" => 12345,
            "client_secret" => 'agibsgiasbgoaigbasorgibas((',
            "redirect_uri" => 'https://mysite.com/approved'
        );
        $postString = rawurldecode(http_build_query( $params ));
        
        $ch = curl_init('https://stackexchange.com/oauth/access_token');
        
        curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, false );
        curl_setopt( $ch, CURLOPT_HEADER, false );
        curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
        curl_setopt( $ch, CURLOPT_POST, true );
        curl_setopt( $ch, CURLOPT_POSTFIELDS, $postString );
        
        $httpResponse = curl_exec( $ch );
        
        parse_str($httpResponse, $output);
        
        return $output["access_token"];
    }