Sends Invoice via SMS

var options = new RestClientOptions("https://apitest.nilvera.com")
{
    MaxTimeout = -1
};
var client = new RestClient(options);
var request = new RestRequest("/earchive/Invoices/Sms/Send", Method.Post);
request.AddHeader("Content-Type", "application/json");
request.AddHeader("Authorization", "Bearer <API KEY>");
var body = @"
{
    ""UUID"": ""3fa85f64-5717-4562-b3fc-2c963f66afa6"",
    ""Phone"": ""string""
}";
request.AddStringBody(body, DataFormat.Json);
RestResponse response = await client.ExecuteAsync(request);
Console.WriteLine(response.Content);