public class Purchase {
	double value;
	String category; //Such as "Food", "Drink".
	String mode; //Contactless purchase mode "RobotPay","DroidCard"
	public Purchase(String c, String t, double v) { 
		value     = v;
		category  = c;
		mode      = t;
	}
	public double getValue() { return value; }
	public String getMode() { return mode; }
	public String getCategory() { return category;}
	public String toString() { return "[ " + category + ", " + mode + ", " + value + " ]"; }
}