"The client credentials are invalid" or "Missing required fields"

[Ahmet Durdu]

Hi,

I am trying to use my old imgur pro account. My account started at 01.12.2014. I uploaded many imut ages with my java program and I did not get any error until now. I can get pin but when  trying to exchange the pin with token the program throws exception. 

        

        String url = "https://api.imgur.com/oauth2/token";

        HttpClient client = HttpClientBuilder.create().build();

        HttpPost post = new HttpPost(url);

        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();

        nameValuePairs.add(new BasicNameValuePair("client_id",  account.getClientId()));

        nameValuePairs.add(new BasicNameValuePair("client_secret", account.getClientSecret()));

        nameValuePairs.add(new BasicNameValuePair("grant_type", "pin"));

        nameValuePairs.add(new BasicNameValuePair("pin", account.getPin()));

        post.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        HttpResponse response = client.execute(post);

        System.out.println("Response Code : "  + response.getStatusLine().getStatusCode());     // Response Code : 400

        BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

    

the response is "{"data":{"error":"The client credentials are invalid","request":"\/oauth2\/token","method":"POST"},"success":false,"status":400}[\r][\n]" 

the second way is 

        url = new URL("https://api.imgur.com/oauth2/token");

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

        // create base64 image

        BufferedImage image = null;

        // read image

        conn.setDoOutput(true);

        conn.setDoInput(true);

        conn.setRequestMethod("POST");

        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

        conn.connect();

        StringBuilder stb = new StringBuilder();

        DataOutputStream wr = new DataOutputStream(conn.getOutputStream());

        String parameters = "client_id=" + account.getClientId() + "&client_secret=" + account.getClientSecret() + "&grant_type=pin&pin=" + account.getPin();

        wr.writeBytes(parameters);

        wr.flush();

        BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));

the response  is {"data":{"error":"Missing required fields","request":"\/oauth2\/token","method":"GET"},"success":false,"status":400}

A few weeks ago I was using to upload images to imgur with second way but now I could not. Could you help me to find the problem ?

ps: I hope I can explain my problem clearly.

Thank you.