class myBatch
{
	// commonly required method put into parent 
	// class referencing properties defined in child
	public function foo()
	{
		sumNums()
	}
}

class myBatchClientTrustGicPurchase extends myBatch
{
	// properties specific to the extending class
	public function sumNums()
	{
		return 1+5+18;
	}
}

class myBatchClientTrustGicPurchase extends myBatch
{
	// properties specific to the extending class
	public function sumNums()
	{
		return 100+9+47;
	}
}