Http web request (post) C# problem

Hello Guys i have a website that i want to login to it with a program so i made a class which will get payload .
:


But the question is everytime the ssid change randomly so i don't know what to do for that ??

What I have tried:

<pre> 

The paylod from the website is this ==>
<pre>userID: 
Ashkan1231231
password: 
dads
accountType: 
userTypeCode: 
C
pm_fp: 
version=1&pm_fpua=mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/107.0.0.0 safari/537.36|5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36|Win32&pm_fpsc=24|1920|1080|1040&pm_fpsw=&pm_fptz=3.5&pm_fpln=lang=en-US|syslang=|userlang=&pm_fpjv=0&pm_fpco=1
currentFormId: 
login
rememberOption: 
on
link: 
intcpt: 
ssid: 
4508513f-adae-424a-9d23-a31a656092f-1668367304029

and my C# class is this :

public class LoginDetails
        {
            public string userID { get; set; }
            public string password { get; set; }
            public string currentFormId { get; set; }
            public string ssid { get; set; }
            public string userTypeCode { get; set; }
            public string pm_fp {get;set;}
        
            public string accountType { get; set; }
                        public string link { get; set; }

                        public string intcpt { get; set; }

        
           
          


        }

<pre>LoginDetails loginDetails = new LoginDetails {
 userID = email,
                password = password,
                accountType = "",
                userTypeCode = "c",
                pm_fp = "version=1&pm_fpua=mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/107.0.0.0 safari/537.36|5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36|Win32&pm_fpsc=24|1920|1080|1038&pm_fpsw=&pm_fptz=3.5&pm_fpln=lang=en-US|syslang=|userlang=&pm_fpjv=0&pm_fpco=1",

                currentFormId = "login",
                link = "",
               intcpt = "",
**               ssid = "7f5fa66c-c082-406f-bb16-d6d459ea7ae-1668352313847"
**              }