code: function MerchantCalculations (objGoogleCheckout) {
  	var self = this;
  	
  	//todo: check the constructor name
  	assert.ok(objGoogleCheckout, "A GoogleCheckout object is the only required argument");
  	
  	self.gc = objGoogleCheckout;
  	self.settings = self.gc.settings;
  }
docs: Instantiate an instance of the GoogleCheckout MerchantCalculations prototype
  
  Examples:
  
  @param {Object} objGoogleCheckout an instance of a `GoogleCheckout` object object
  @return {Object} Polling Object
  @api public