using RestSharp;


var options = new RestClientOptions("https://api.sandbox.{id}.gr4vy.app/buyers/{buyer_id}/shipping-details");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("Authorization", "Bearer <token>");
var response = await client.GetAsync(request);

Console.WriteLine("{0}", response.Content);

{
  "items": [
    {
      "type": "shipping-details",
      "id": "8724fd24-5489-4a5d-90fd-0604df7d3b83",
      "buyer_id": "8724fd24-5489-4a5d-90fd-0604df7d3b83",
      "first_name": "John",
      "last_name": "Lunn",
      "email_address": "john@example.com",
      "phone_number": "+1234567890",
      "address": {
        "city": "London",
        "country": "GB",
        "postal_code": "789123",
        "state": "Greater London",
        "state_code": "GB-LND",
        "house_number_or_name": "10",
        "line1": "10 Oxford Street",
        "line2": "New Oxford Court",
        "organization": "Gr4vy"
      }
    }
  ]
}