/// <summary>
/// Send a cancel transaction after an authorize transaction to cancel it.
/// </summary>
/// <param name="transactionNumber">The transactionNumber of the transaction you wish to cancel.</param>
public async Task <CancelResult> Cancel(int transactionNumber)
{
// Validation
if (transactionNumber <= 0)
{
throw new ArgumentOutOfRangeException(nameof(transactionNumber), "transactionNumber is required");
}
// Build string for md5 including all fields except empty strings
var hashInput = new StringBuilder();
hashInput.Append(Account.AccountNumber);
hashInput.Append(transactionNumber);
// Add encryption key at the end of string to be hashed
hashInput.Append(Account.EncryptionKey);
// Create a hash string from the parameters
string hash;
MD5Hash.Hash(hashInput.ToString(), out hash);
// Invoke Initialize method on external PayEx PxOrder web service
var payexOrder = GetPxOrderClient();
var xmlReturn = await payexOrder.Cancel2Async(Account.AccountNumber, transactionNumber, hash);
// Parse the result and retrieve code-node to figure out if the service method was invoked successfully.
var result = ResultParser.ParseCancelResult(xmlReturn);
return(result);
}
