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Need help to find where does API takes data from in ASP.NET MVC

I am a begginer and i work in a MVC project which I cant understand it well yet.
I can't understand where does the API takes data from when I try to connect in Login Screen.
It doesn't use Entity Framework and there isn't a json with the data.
When I enter Id and Pass it calls an API (GetAPIResponse) which somehow finds that is correct.
Need help to understand the code and the logic behind it.
LoginBL class contains:
public bool IsAuthenticated(LoginEntity user)
{
string url = string.Empty;
string callType = string.Empty;
string server = string.Empty;
try
{
// get URL, Call type, Server from config file
url = ConfigurationManager.AppSettings["login_url"].ToString();
callType = ConfigurationManager.AppSettings["calltype"].ToString();
server = ConfigurationManager.AppSettings["server"].ToString();
// Encrypt password
string password = Scrambler.GenerateMD5Hash(user.Password);
// Prepare content for the POST request
string content = #"calltype=" + callType + "&server=" + server + "&user=" + user.UserName + "&pass=" + password + "";
Debug.WriteLine("Callcenter login url: " + content);
HttpResponseMessage json_list = ApiCallBL.GetAPIResponse(url, content);
LoginResponseEntity obj = new LoginResponseEntity();
obj = JsonConvert.DeserializeObject<LoginResponseEntity>(json_list.Content.ReadAsStringAsync().Result);
Debug.WriteLine(callType + " Response: " + json_list.Content.ReadAsStringAsync().Result);
//if API resultCode return 0 then user details and token save in session for further use
if (obj.ResultCode == 0)
{
int restrict = obj.UserInfo.RestrictCallType.HasValue ?
obj.UserInfo.RestrictCallType.Value : 0;
HttpContext.Current.Session["user_id"] = obj.UserInfo.usr_id;
HttpContext.Current.Session["user_name"] = obj.UserInfo.usr_username;
HttpContext.Current.Session["user_group_id"] = obj.UserInfo.UserGroupID;
HttpContext.Current.Session["groupid"] = obj.UserInfo.groupid;
HttpContext.Current.Session["token"] = obj.Token;
HttpContext.Current.Session["web_server_url"] = obj.ServerInfo.web_server_url;
HttpContext.Current.Session["centerX"] = obj.ServerInfo.DefaultGeoX;
HttpContext.Current.Session["centerY"] = obj.ServerInfo.DefaultGeoY;
HttpContext.Current.Session["dateFormat"] = obj.ServerInfo.dateFormat;
HttpContext.Current.Session["currency"] = obj.ServerInfo.currency;
HttpContext.Current.Session["customer_img"] = obj.ServerInfo.customer_img;
HttpContext.Current.Session["groups"] = obj.groups;
HttpContext.Current.Session["restrict_call_type"] = restrict ;
Debug.WriteLine("obj.UserInfo.UserGroupID " + obj.UserInfo.UserGroupID);
Debug.WriteLine("obj.UserInfo.groups " + obj.groups);
//HttpContext.Current.Session["defaultLanguage"] = obj.ServerInfo.defaultLanguage;
HttpCookie cookie = new HttpCookie("Login");
// if remember me checked then user name and password stored in cookie else cookes is expired
if (user.RememberMe)
{
cookie.Values.Add("user_name", obj.UserInfo.usr_username);
cookie.Values.Add("pwd", user.Password);
cookie.Expires = DateTime.Now.AddDays(15);
HttpContext.Current.Response.Cookies.Add(cookie);
}
else
{
cookie.Expires = DateTime.Now.AddDays(-1);
HttpContext.Current.Response.Cookies.Add(cookie);
}
return true;
}
else
{
//ResultCode -5 :Invalid Login ,-1:Database Error ,-2:Server Error ,-3:Invalid Parameter specified ,-4:Invalid Token
return false;
}
}
catch
{
throw;
}
finally
{
url = string.Empty;
callType = string.Empty;
server = string.Empty;
}
}
Okay here after converts pass to MD5 creates a "string content" with the information given.
Then in next line (HttpResponseMessage json_list = ApiCallBL.GetAPIResponse(url, content);) calls the API with the url and content as parameters where it finds if the data exists.
API code:
public static HttpResponseMessage GetAPIResponse(string url, string content)
{
StringBuilder traceLog = null;
HttpContent httpContent = null;
try
{
traceLog = new StringBuilder();
traceLog.AppendLine("Start: BusinessLayer getAPIResponse() Request Data:- " + DateTime.Now + "URL = " + url + "&content = " + httpContent);
using (HttpClient client = new HttpClient())
{
httpContent = new StringContent(content);
httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
var resp = client.PostAsync(url, httpContent).Result;
Debug.WriteLine("resp: " + resp.Content.ReadAsStringAsync().Result);
traceLog.AppendLine("End: BusinessLayer getAPIResponse() call completed HttpResponseMessage received");
return resp;
}
}
catch
{
throw;
}
finally
{
traceLog = null;
httpContent.Dispose();
url = string.Empty;
content = string.Empty;
}
}
In the following line, console prints the result that I cant understand where it cames from (Debug.WriteLine("resp: " + resp.Content.ReadAsStringAsync().Result);)
Sorry for the confusion , I am in my first job with zero work experience and I am called to learn how this works alone without proper education on ASP.NET from them.

You will not go very far without debbugger. Learn how to debug in Visual Studio (YouTube tutorials might be fastest way). Place debug points along critical points in code (for example moment when client sends and receives response is line var resp = client.PostAsync...) and check variables.
Url for API server is actually defined in the line
url = ConfigurationManager.AppSettings["login_url"].ToString();
ConfigurationManager means Web.config file, check it's appSettings section for login_url entry, there is your url.
Btw, using (HttpClient client = new HttpClient()) is not a good way to use a HttpClient and will lead to port exhaustion. It's ok for small number of requests, but for larger ones you must reuse it, or use HttpClientFactory (for .NET Core).

Lead Ads Testing Tool - Server failure (102)

I'm trying to get Facebook leadgen ad data.
1-)As seen below, facebook sends the data to me successfully and I receive it successfully.
Successful Process img
2-)But the submissions I made on just this page do not come. What could be the reason for this?
Failed Process img
*But only the opinions I made on this page are not coming. What could be the reason for this?
Facebook doesn't even post. As seen in the picture, Server failure (102) information is displayed. What is the reason of this?
3-)The code I received the incoming data
Asp.Net Api Method
public async Task<HttpResponseMessage> Post([FromBody] JsonData data)
{
try
{
dbmanager db = new dbmanager();
db.Jsonkaydetv2(data);
var entry = data.Entry.FirstOrDefault();
var change = entry?.Changes.FirstOrDefault();
if (change == null) return new HttpResponseMessage(HttpStatusCode.BadRequest);
//Generate user access token here https://developers.facebook.com/tools/accesstoken/
const string token = "XXXX";
var leadUrl = $"https://graph.facebook.com/v2.10/{change.Value.LeadGenId}?access_token={token}";
var formUrl = $"https://graph.facebook.com/v2.10/{change.Value.FormId}?access_token={token}";
using (var httpClientLead = new HttpClient())
{
var response = await httpClientLead.GetStringAsync(formUrl);
if (!string.IsNullOrEmpty(response))
{
var jsonObjLead = JsonConvert.DeserializeObject<LeadFormData>(response);
db.JsonkaydetLeadFormData(jsonObjLead);
//jsonObjLead.Name contains the lead ad name
//Jsonkaydet(jsonObjLead.Name+"x");
//If response is valid get the field data
using (var httpClientFields = new HttpClient())
{
var responseFields = await httpClientFields.GetStringAsync(leadUrl);
if (!string.IsNullOrEmpty(responseFields))
{
var jsonObjFields =JsonConvert.DeserializeObject<LeadData(responseFields);
db.JsonkaydetLeadData(jsonObjFields);
//jsonObjFields.FieldData contains the field value
}
}
}
}
return new HttpResponseMessage(HttpStatusCode.OK);
}
catch (Exception ex)
{
Jsonkaydet(ex.ToString());
Trace.WriteLine($"Error-->{ex.Message}");
Trace.WriteLine($"StackTrace-->{ex.StackTrace}");
return new HttpResponseMessage(HttpStatusCode.BadGateway);
}
}

Error in creating twitterizer app in asp.net

I am using Twitterizer dll to post a twit on twitter via oauth method but it give me error.
"Whoa there!
There is no request token for this page. That's the special key we need from applications asking to use your Twitter account. Please go back to the site or application that sent you here and try again; it was probably just a mistake."
And my code is:
using System;
using Twitterizer;
public partial class Home : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
var oauth_consumer_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
var oauth_consumer_secret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
if (Request["oauth_token"] == null)
{
OAuthTokenResponse reqToken = OAuthUtility.GetRequestToken(oauth_consumer_key, oauth_consumer_secret,
Request.Url.AbsoluteUri);
Response.Redirect(string.Format("http://Twitter.com/oauth/authorize?oauth_token+{0}", reqToken.Token));
}
else
{
string requestToken = Request["oauth_token"].ToString();
string pin = Request["oauth_verifier"].ToString();
var tokens = OAuthUtility.GetAccessToken(oauth_consumer_key, oauth_consumer_secret, requestToken, pin);
OAuthTokens accessToken = new OAuthTokens()
{
AccessToken = tokens.Token,
AccessTokenSecret = tokens.TokenSecret,
ConsumerKey = oauth_consumer_key,
ConsumerSecret = oauth_consumer_secret
};
TwitterResponse<TwitterStatus> response = TwitterStatus.Update(accessToken, "Hello everyone, today it's too hot (weather)!!!");
if (response.Result == RequestResult.Success)
{
Response.Write("It's done");
}
else
{
Response.Write("Fail");
}
}
}
}
Please help me..

Seeing no one is giving an answer to your problem, I can suggest the library I am working on.
With Tweetinvi you will be able to do what you want with the following code :
// Step 1 : Redirect user to go on Twitter.com to authenticate
public ActionResult TwitterAuth()
{
var appCreds = new ConsumerCredentials("CONSUMER_KEY", "CONSUMER_SECRET");
// Specify the url you want the user to be redirected to
var redirectURL = "http://" + Request.Url.Authority + "/Home/ValidateTwitterAuth";
var authenticationContext = AuthFlow.InitAuthentication(appCreds, redirectURL);
return new RedirectResult(authenticationContext.AuthorizationURL);
}
// Step 2 : On redirected url
public ActionResult ValidateTwitterAuth()
{
// Get some information back from the URL
var verifierCode = Request.Params.Get("oauth_verifier");
var authorizationId = Request.Params.Get("authorization_id");
// Create the user credentials
var userCreds = AuthFlow.CreateCredentialsFromVerifierCode(verifierCode, authorizationId);
// Do whatever you want with the user now!
ViewBag.User = User.GetAuthenticatedUser(userCreds);
return View();
}
Authentication Documentation : https://github.com/linvi/tweetinvi/wiki/Authentication
I know this is not helping for your Twitterizer but you might want to consider it.

Receiving IPN and SSL Secure Channel

I have a project in MVC. Using IPN to receive notifications of payments made to update the database. The project works fine until I click "Return to ___ Test Store".
I receive the following server error:
Controller: I followed this example => PayPal & MVC
if (sAmountPaid != null)
{
// look up the requested service using the item_number
int id = int.Parse(Request["item_number"]);
var requestedService = db.RequestedServices.Where(rs => rs.RequestedServiceId == id).SingleOrDefault();
// look up the payment adjustment
var paymentAdjustment = requestedService.PaymentAdjustments.FirstOrDefault();
decimal amount = decimal.Parse(Request["mc_gross"]); // pull out the total amount
string payerEmail = Request["payer_email"]; // and the paypal user email
// before creating a new payment object, make sure there isn't an item with the transaction id already
// in the database
var paymentCheck = db.Payments.Where(p => p.TransactionId == transactionID).SingleOrDefault();
if (paymentCheck != null)
{
ViewBag.Success = "yes";
return View();
}
// if a payment with that id hasn't been made, create one
Payment payment = new Payment()
{
DateSubmitted = DateTime.Now.AddHours(2),
IsActive = true,
IsCompleted = false,
RequestedServiceId = id,
TransactionId = transactionID,
Amount = amount,
Email = payerEmail,
};
// set the payment completion status based on the result
if (Request["payment_status"].ToLower() == "completed")
{
payment.IsCompleted = true;
paymentAdjustment.IsCompleted = true;
}
db.Payments.Add(payment);
db.Entry(paymentAdjustment).State = EntityState.Modified;
db.SaveChanges();
// send an email notifying the contractor that a new service has been requested
IEmailSender emailsender = new GoDaddyEmailSender(); // send the emails via GoDaddy (implementing IEmailSender interface)
string subject = "Full Payment Adjustment Completed!";
string body = null;
var customer = db.my_aspnet_users.Where(u => u.id == requestedService.UserId).SingleOrDefault();
var yardladEmail = db.SiteSettings.Where(ss => ss.Name == "Yard Lad Contact Email").Single().Value;
foreach (var user in requestedService.Contractor.ContractorUsers)
{
var recipientEmail = Membership.GetUser(user.UserId, false).Email;
var userProfile = db.UserProfiles.Where(up => up.UserId == user.UserId).SingleOrDefault();
body += "<p>A new payment amount for the " + requestedService.ContractorService.Service.Name.ToLower() + " service has been completed!</p>";
body += "<p>Login to your account here to view the changes</p>";
// send email to the users (will need to replace the emails when deploying)
try
{
emailsender.SendEmail(subject, body, from: yardladEmail, recipient: recipientEmail);
}
catch (Exception ex)
{
// log
}
}
ViewBag.Success = "yes";
return View();
}
I have tried running the debugger, but when it reaches this portion of my controller nothing is triggered. All other steps and processes before work with no problems.

Verify app invite server-side

When our mobile app user sends app-invite to fb user and he accepts it, the server should give a reward to the first one. So I need a way to verify whether the invite was sent.
var fb = new FacebookClient(APP_ID + "|" + SECRET_ID);
fb.AppId = APP_ID;
fb.AppSecret = SECRET_ID;
dynamic result = fb.Get(???);
I searched on GraphAPI docs and it seems that I need to retrieve users apprequests. How to do that from the server side and where to look at to perform such verification?
UPDATE
Ok, now I know that it's allowed to reward only for accepted invites. I can record who invites who in the db and give a reward only when a new invited user joins. But I still need a way to verify that these invites were actually sent.
UPDATE2
As the documentation states apprequests call from application returns all the requests sent from this application. So I think it would be enough for me to just check that there are any requests from this app:
dynamic result = fb.Get("/" + facebookId + "/apprequests");
IEnumerable data = result.data;
return data.Cast<object>().Count() != 0;
But I can't check it now. Can anyone confirm that if a user sends invite to app to another user this invite will be seen through apprequests from the application access token?

my code for this:
public static FacebookRequestData GetInviteHash()
{
string requestId = Request["request_ids"];
var accessToken = GetAccessToken(ConfigurationManager.AppSettings["FacebookAppId"], ConfigurationManager.AppSettings["FacebookSecret"]);
string response;
using (var webClient = new WebClient())
{
response = webClient.DownloadString(string.Format("https://graph.facebook.com/{0}?{1}", requestId, accessToken));
}
var javaScriptSerializer = new JavaScriptSerializer();
return javaScriptSerializer.Deserialize<FacebookRequestData>(javaScriptSerializer.Deserialize<FacebookRequestInfo>(response).data);
}
private static string GetAccessToken(string appId, string password)
{
using (var webClient = new WebClient())
{
return webClient.DownloadString(string.Format("https://graph.facebook.com/oauth/access_token?client_id={0}&client_secret={1}&grant_type=client_credentials", appId, password));
}
}
private class FacebookRequestInfo
{
public string data { get; set; }
}
FacebookRequestData - my custom class with structure of fields that I posted to fb earlier

Done it:
public static bool CheckInvite(string fromId, string toId)
{
var fb = new FacebookClient(APP_ID + "|" + SECRET_ID);
fb.AppId = APP_ID;
fb.AppSecret = SECRET_ID;
dynamic result = fb.Get(string.Format("/{0}/apprequests", toId));
foreach (var el in result.data)
if ((string)el.from.id == fromId)
{
DateTime dateTime = DateTime.Parse((string)el.created_time, CultureInfo.InvariantCulture);
if ((DateTime.Now - dateTime).TotalMinutes < 15)
{
return true;
}
}
return false;
}