Using IActionResult in Minimal API

program.cs

app.MapPost("/api/messenger", (Func<ContactModel, IMailService, IGoogleCaptchaService, string, Task<IActionResult>>)
  (async ([FromBody] model, svc, captcha, template) =>
{
  if (await captcha.Verify(model.Recaptcha))
  {
    if (await svc.SendMailAsync(template, model))
    {
      return new OkResult();
    }
  }
  return new BadRequestResult();
}));