public static HttpRequestMessage BuildTokenRequestMessage(PayUClientSettings settings, TrustedMerchant tm)
{
var message = new HttpRequestMessage();
message.Headers.Accept.Add(PayUContainer.ContentJson);
message.Method = HttpMethod.Post;
message.RequestUri = PayUClientUrlBuilder.BuildOAuthTokenUrl(settings.Url);
message.Content = tm != null?GetTrustedTokenBody(settings, tm) : GetTokenBody(settings);
return(message);
}