trouble passing multiple RTP's in Rest api Business rule execution

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Thanks to Manfredi's help I have code to execute a business rule using a Rest call.  It works beautifully for a business rule that has one RTP.  I'm having trouble trying to adapt it so that I can pass more that one RTP parameter into the business rule. In other words I'd like to create another string variable similar to sEntity to capture a second POV dimension member then pass it in as a second parameter 

//Get the Current Entity from POV
String sEntity = operation.grid.pov.find{it.dimName =='Entity'}.essbaseMbrName

Map<String, String> Params = new HashMap<String, String>()