Taslak Oluşturur

var options = new RestClientOptions("https://apitest.nilvera.com")
{
  MaxTimeout = -1,
};
var client = new RestClient(options);
var request = new RestRequest("/ebill/Draft/Create", Method.Post);
request.AddHeader("Authorization", "Bearer <API KEY>");
request.AddHeader("Content-Type", "application/json");
var body = @"{
  "Bill": {
    "BillInfo": {
      "UUID": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
      "TemplateUUID": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
      "TemplateBase64String": "string",
      "BillSerieOrNumber": "string",
      "IssueDate": "2023-03-21T14:33:11.705Z",
      "CurrencyCode": "string",
      "ExchangeRate": 0,
      "RelatedDocument": {
        "Type": "EFATURA",
        "Code": "string"
      },
      "ValidityPeriod": {
        "StartDate": "2023-03-21T14:33:11.706Z",
        "EndDate": "2023-03-21T14:33:11.706Z"
      }
    },
    "CompanyInfo": {
      "TaxNumber": "string",
      "Name": "string",
      "TaxOffice": "string",
      "PartyIdentifications": [
        {
          "SchemeID": "string",
          "Value": "string"
        }
      ],
      "AgentPartyIdentifications": [
        {
          "SchemeID": "string",
          "Value": "string"
        }
      ],
      "Address": "string",
      "District": "string",
      "City": "string",
      "Country": "string",
      "PostalCode": "string",
      "Phone": "string",
      "Fax": "string",
      "Mail": "string",
      "WebSite": "string"
    },
    "CustomerInfo": {
      "TaxNumber": "string",
      "Name": "string",
      "TaxOffice": "string",
      "PartyIdentifications": [
        {
          "SchemeID": "string",
          "Value": "string"
        }
      ],
      "AgentPartyIdentifications": [
        {
          "SchemeID": "string",
          "Value": "string"
        }
      ],
      "Address": "string",
      "District": "string",
      "City": "string",
      "Country": "string",
      "PostalCode": "string",
      "Phone": "string",
      "Fax": "string",
      "Mail": "string",
      "WebSite": "string"
    },
    "SellerInfo": {
      "User": "string",
      "TableNo": "string",
      "Address": "string",
      "District": "string",
      "City": "string",
      "Country": "string",
      "PostalCode": "string",
      "Phone": "string",
      "Fax": "string",
      "Mail": "string",
      "WebSite": "string"
    },
    "BillLines": [
      {
        "Name": "string",
        "Quantity": 0,
        "UnitType": "string",
        "Price": 0,
        "KDVPercent": 0,
        "KDVTotal": 0
      }
    ],
    "Notes": [
      "string"
    ]
  }
}";
request.AddStringBody(body, DataFormat.Json);
RestResponse response = await client.ExecuteAsync(request);
Console.WriteLine(response.Content);