SmsApi.cs

public class SmsApi : ISmsService
{
    private readonly SMSFactory _smsFactory;

    public SmsApi()
    {
        _smsFactory = new SMSFactory(new ClientOAuth("token"));
    }
    
    public async Task Send(string from, string to, string body)
    {
        await _smsFactory
            .ActionSend()
            .SetTo(to)
            .SetText(body)
            .ExecuteAsync();
    }
}