public async Task LunchPaymentPage(HttpContext httpContext, string authorizationUrl)
{
Microsoft.AspNetCore.Http.HttpResponse response = httpContext.Response;
response.Clear();
StringBuilder form = new StringBuilder();
form.Append("<html>");
form.AppendFormat("<body onload='document.forms[0].submit()'>");
form.AppendFormat("<form action='{0}' method='post'>", authorizationUrl);
form.Append("</form>");
form.Append("</body>");
form.Append("</html>");
HasLunchedPaymentPage = true;
await response.WriteAsync(form.ToString());
//response.Write(form.ToString());
//response.End();
}
