private async Task <PaymentResponseContainer> CreatePayment(string baseUrl, string clientName, PaymentRequest payment)
{
payment.SetMissingMerchantInformationFromOptions(Options(clientName));
var payload = new PaymentRequestContainer(payment);
Func <ProblemsContainer, Exception> onError = m => new CouldNotPlacePaymentException(payment, m);
var url = $"{baseUrl}?$expand=prices,captures,payeeinfo,urls,transactions,authorizations,reversals,cancellations";
var res = await CreateInternalClient(clientName).HttpPost <PaymentRequestContainer, PaymentResponseContainer>(url, onError, payload);
return(res);
}