asp.net mvc 3 - Need to know how to pass a model for paypal transaction -

i have simple order form created in mvc , when hit submit button, have user redirected paypal payment , redirected original page. i'm trying find out how either pass model information or save somehow because after payment complete, program sends them email copy of receipt , successful purchase. how go doing this? please let me know if there else need see. i'm still brand new mvc , i'm trying figure out.

model

public class writingappmodel {     [required(errormessage = "name required")]     public string name { get; set; }      [emailaddress(errormessage = "a valid email address required.")]     [required(errormessage = "email address required.")]     public string email { get; set; }      [phone(errormessage = "a valid phone number required.")]     [required(errormessage = "phone number required.")]     public string phonenumber { get; set; }      [required(errormessage = "subject required.")]     public string subject { get; set; }      [required(errormessage = "topic required.")]     public string topic { get; set; }      [required(errormessage = "document type required.")]     public string documenttype { get; set; }      [required(errormessage = "urgency required.")]     public string urgency { get; set; }      [required(errormessage = "number of pages required.")]     public int16 numberofpages { get; set; }      [required(errormessage = "requirements required.")]     [datatype(datatype.multilinetext)]     [stringlength(200)]     public string requirements { get; set; }      [required(errormessage = "writing style required.")]     public string style { get; set; }      [required(errormessage = "spacing required.")]     public string spacing { get; set; }      [required(errormessage = "academic level required.")]     public string academiclevel { get; set; }      [required(errormessage = "number of sources required.")]     public int16 numberofsources { get; set; }      [required(errormessage = "price required.")]     [range(0.01, 10000.00, errormessage = "your quote not complete because haven't completed of steps.")]     [datatype(datatype.currency)]     [displayformat(dataformatstring = "{0:c}")]     public decimal price { get; set; }      public string unformattedprice     {                 {             return this.price.tostring();         }     }      [required(errormessage = "currency required.")]     public string currency { get; set; } }