MellonGroupPOS.cancelCompletedTransaction Method
        
		
       
       
        Start a new intent to void a transaction. Reference the transaction that needs to be voided using the original transaction intent. 
This function is not available in the Trial Version.
		
	
	
	
				
			
	
			
				
				
				
				
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					This language is not supported or no code example is available.
			
				 
			 
		 
		
		
	 
	Parameters
	- 
		
			APIKey
		
	
 
	- 
		string 
	
 
	The API key that is obtained by the getApiKey method. 
	- 
		
			posID
		
	
 
	- 
		string 
	
 
	You obtained the POS ID by using the getTerminalList[0].id 
	- 
		
			transactionId
		
	
 
	- 
		string 
	
 
	You obtained the Transaction ID using the sendTransaction 
	
		Return Value
	Dictionary<
string, 
string> 
	
	
 
 
  
	
	
	
	
	
	
		
  
.NET Framework
Supported in: 3.5 or newer