I need assistance on creating a contact form

Request Format

Conten-Type: application/json
        {

         "apiKey": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX",

         "firstName": "Testfirst",

         "lastname": "Testlast",

         "Address": "801 test Corner Ct",

         "Address2": "apt a",

         "city": "Green Bay",

         "postalcode": "55555",

         "state": "WI",

         "country": "US",

         "Email": "[test@test.com](mailto:test@test.com)",

         "Phone": "5555555555",

         "AlternatePhone": "5555555555",

         "YearHighestEducationCompleted": "1978",

         "ExternalSystemId": "123"

        }