Paypal Integration Java - Unable to process your request

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I am trying to integrate Paypal REST service to process payment on my website. I have developers accounts in order to test my servlets and jsp pages. I can get a token, emulate a payment and get approval URL from paypal servers. But when I go to that approval URL and login, an error message shows up that you can see below.

I have no error code or explicit message that helps me fixing this. Do you have any idea about what can cause this behavior?

Thanks for helping.

Here is the servlet I am using:

@WebServlet(name="PaypalPayment", urlPatterns={"/paypal-payment.html"}) public class Paypal_Payment extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    OAuthTokenCredential token;
    String accessToken;
    APIContext apiContext;
    Payment createdPayment;
    String paypalValidationURL;

    try{
        token = new OAuthTokenCredential(Constantes.PAYPAL_CLIENT_ID, Constantes.PAYPAL_CLIENT_SECRET);
        accessToken = token.getAccessToken();

        //Token récupéré => on crée le context paypal avec tous les objets (ici tout est en dur pour le test, apres on récuperera les données entrée par l'user)
        apiContext = new APIContext(accessToken);

        //Montant de la transaction
        Amount amount = new Amount();
        amount.setCurrency("EUR");
        amount.setTotal("25");

        //Création de la transaction
        Transaction transaction = new Transaction();
        transaction.setDescription("Creating Payment");

        //Passage de l'objet montant à la transaction
        transaction.setAmount(amount);

        //Liste des transactions
        List<Transaction> transactions = new ArrayList<Transaction>();
        transactions.add(transaction);

        //Création d'un objet Payer avec les infos de l'user
        Payer payer = new Payer();
        payer.setPaymentMethod("paypal");

        //Création de l'objet payment, on lui passe le but du payment (acheter ou vendre), le payer et la liste des transactions
        Payment payment = new Payment();
        payment.setIntent("sale");
        payment.setPayer(payer);
        payment.setTransactions(transactions);

        //Gestion des urls de retour (en cas d'annulation et de validation
        RedirectUrls redirectUrls = new RedirectUrls();
        redirectUrls.setCancelUrl("http://localhost:8080/a-vos-cas-JSP/paypal-cancel.html");
        redirectUrls.setReturnUrl("http://localhost:8080/a-vos-cas-JSP/paypal-response.html");

        //On passe les urls à l'objet payment
        payment.setRedirectUrls(redirectUrls);

        //On execute le payment
        //payment.create(apiContext);
        createdPayment = payment.create(apiContext);
        System.out.println("TEST : " + createdPayment);

        paypalValidationURL = createdPayment.getLinks().get(1).getHref();
        System.out.println("URL de validation = " + paypalValidationURL);

        response.sendRedirect(response.encodeURL(paypalValidationURL));
        //getServletContext().getNamedDispatcher(paypalValidationURL).forward(request, response);

    }catch(PayPalRESTException e){
        e.printStackTrace();
    }
}

asked 1 min ago

SirPsycho

11