How to post JSON data to Pardot API via Httpclient - httpclient

Question

I am trying to post the JSON data to Pardot. I have used the info from here to call the Pardot API and currently using Pardot form handler to post the data. I want to know if i could the data via Pardot API call by using CREATE or UPSERT instead of using a form handler.
Below is my code
class SendingDataToPardot
{
public string Login()
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
var url = "https://pi.pardot.com/api/login/version/3";
string apiKey = null;
var loginInfo = new Dictionary<string, string>
{
{"email", "xx"},
{"password", "xxx"},
{"user_key", "xxx"}
};
var httpContent = new FormUrlEncodedContent(loginInfo);
using (var client = new HttpClient())
{
HttpResponseMessage response = client.PostAsync(url, httpContent).Result;
if (response.IsSuccessStatusCode)
{
string resultValue = response.Content.ReadAsStringAsync().Result;
apiKey = XDocument.Parse(resultValue).Element("rsp").Element("api_key").Value;
return apiKey;
}
else
{
return null;
}
}
}
public string POST()
{
string Api_Key = Login();
var url = "form handler url";
var contactFormData = new Dictionary<string, string>
{
{"email", "test#test.com"},
{"FirstName", "xxx"},
{"LastName", "xxxxx"},
{"Comments", "this is a test"}
};
var data= new FormUrlEncodedContent(contactFormData);
using (var client = new HttpClient())
{
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", Api_Key);
HttpResponseMessage response = client.PostAsync(url, data).Result;
string result = response.Content.ReadAsStringAsync().Result;
return result;
}
}
}
}

Answer 1

For most of the APIs Pardot exposes, you need to do XML work with it.
Looks like you are using Java, so you might have luck using a public library, even if just for understanding communication patterns (we had to rewrite it for our purposes, but it did serve as a great blueprint).
Have a look at the https://github.com/Crim/pardot-java-client project and see if it helps you out.