Receive an OTP in C# / .NET

No SDK needed — the REST API is a couple of HttpClient calls.

using var http = new HttpClient();
http.DefaultRequestHeaders.Authorization = new("Bearer", Environment.GetEnvironmentVariable("EVESES_KEY"));

var body = new StringContent(
  """{"country":"ua","mode":"activation","service":"telegram"}""",
  Encoding.UTF8, "application/json");

var created = await http.PostAsync("https://api.eveses.com/api/v1/numbers/orders", body);
var order = await created.Content.ReadFromJsonAsync<Order>();

// poll for the code (or receive it on a webhook endpoint)
string? otp = null;
while (otp is null) {
    var r = await http.GetFromJsonAsync<SmsResponse>(
      $"https://api.eveses.com/api/v1/numbers/orders/{order.OrderId}/sms");
    otp = r?.Sms?.FirstOrDefault()?.Otp;
    if (otp is null) await Task.Delay(1500);
}

For production, expose a webhook controller and verify the HMAC signature rather than polling.

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