const response = await fetch('/api/stok', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer ' + accessToken
  },
  body: JSON.stringify({
    "stokKodu": "STK001",
    "stokAdi": "Örnek Ürün",
    "birim": "Adet",
    "alisFiyati": 100.00,
    "satisFiyati": 150.00,
    "stokMiktari": 50
  })
});

const result = await response.json();
console.log(result);

using (var client = new HttpClient())
{
    client.DefaultRequestHeaders.Authorization = 
        new AuthenticationHeaderValue("Bearer", accessToken);
    
    var response = await client.GetAsync(
        "/api/cari/123/bakiye");
    
    if (response.IsSuccessStatusCode)
    {
        var content = await response.Content
            .ReadAsStringAsync();
        var bakiye = JsonSerializer
            .Deserialize<CariBakiye>(content);
    }
}