Calling PayU rest api (create order) returns html instead of json response

Question

I'm trying to post an order to PayU payment gateway, using Rest Client tools like post man also I got the same issue.

I'm trying to post using C#, the order created successfully but the response is not as expected, it should be a json object contains the inserted order id and the redirect url , but the current is html response!

C# Code response :

My C# Code using restsharp library :

 public IRestResponse<CreateOrderResponseDTO> CreateOrder(CreateOrderDTO orderToCreate)
    {

        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

        var actionUrl = "/api/v2_1/orders/";

        var client = new RestClient(_baseUrl);

        var request = new RestRequest(actionUrl, Method.POST)
        {
            RequestFormat = DataFormat.Json
        };

        request.AddJsonBody(orderToCreate);


        request.AddHeader("authorization", $"Bearer {_accessToken}");
        request.AddHeader("Content-Type", "application/json");

        var response = client.Execute<CreateOrderResponseDTO>(request);

        if (response.StatusCode == HttpStatusCode.OK)
        {
            return response;
        }

        throw new Exception("order not inserted check the data.");


    }

My C# Code using built in WebRequest also returns same html :

 public string Test(string url, CreateOrderDTO order)
    {
        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.ContentType = "application/json";
        httpWebRequest.Accept = "application/json";

        httpWebRequest.Method = "POST";
        httpWebRequest.Headers.Add(HttpRequestHeader.Authorization, "Bearer " + _accessToken);

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {

            streamWriter.Write(new JavaScriptSerializer().Serialize(order));
        }

        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
            return result;
        }
    }

Can anyone advise what I missed here ?

Metalline

What is the HTML? Is it an error page? – Em

@Amy Hi, the html contains a huge svg file you can find the html file for your reference drive.google.com/… – Metalline

Answer 1

After some tries I found that PayU rest api returns 302 (found) also ResponseUri not OK 200 as expected.

by default rest client automatically redirect to this url so I received the html content of the payment page.

The solution is :

client.FollowRedirects = false;

Hope this useful to anyone.

Metalline

So basically they send the proper JSON with a 302 header redirecting to payment site. If redirect is disabled (in case of HttpWebRequest request.AllowAutoRedirect = false;) the JSON can be read normally from the response. The only reason I'm writing this comment is because, I couldn't get it from this question and answare (even though it's there) nor from API Documentation (and it's there as well). If I had trouble with this, maybe someone else will find this comment useful. – Keifer

You saved my day, I was searching for a way to reach out to those guys, but this was much faster, thank you for sharing this answer. – Stooge

Answer 2

In postman, the solution is turning off redirects, like on the image below:

Worked

Answer 3

Also, I would like to add that the above answer by Mohammad is correct as to get the response URL we need to set AllowAutoRedirect to false. I have been trying to implement PayU LatAM WebCheckout in a console app and I was facing similar issue. I got some inspiration from the answer given here: How to get Location header with WebClient after POST request

Based on the answer, I wrote a sample code:

public class NoRedirectWebClient : WebClient
{
    protected override WebRequest GetWebRequest(Uri address)
    {
        var temp = base.GetWebRequest(address) as HttpWebRequest;
        temp.AllowAutoRedirect = false;
        return temp;
    }
}

After creating the above class, I wrote the following code in my Main method:

var request = MakeRequestLocation(new NoRedirectWebClient());
var psi = new ProcessStartInfo("chrome.exe");

psi.Arguments = request.ResponseHeaders["Location"];
Process.Start(psi);

I am now calling the function MakeRequestLocation inside the same class.

private static WebClient MakeRequestLocation(WebClient webClient)
{
    var loginUrl = @"https://sandbox.checkout.payulatam.com/ppp-web-gateway-payu/";
    NameValueCollection formData = new NameValueCollection
    {
        {"ApiKey", "4Vj8eK4rloUd272L48hsrarnUA" },
        {"merchantId", "508029" },
        {"accountId", "512321" },
        {"description", "Test PAYU" },
        {"referenceCode", "SomeRandomReferenceCode" },
        {"amount", "2" },
        {"tax", "0" },
        {"taxReturnBase", "0" },
        {"currency", "USD" },
        {"signature", "Signature generated via MD5 sum" },
        {"buyerFullName", "test" },
        {"buyerEmail", "[email protected]" },
        {"responseUrl", @"http://www.test.com/response" },
        {"confirmationUrl",  @"http://www.test.com/confirmation" }
    };
    webClient.UploadValues(loginUrl, "POST", formData);

    return webClient;
}

The object that is returned by the above function contains a header called location. The value of the location is your required URL for webcheckout.

Premedical