You must hit your minimum funding goal for the campaign to be successful.
We recommend setting the funding goal to the lowest amount of money you can make use of and then specifying how you'd use any extra cash. For instance, if it costs $50,000 to purchase a new budget-widget-maker, but you could use $500,000 for a super-awesome-widget maker, set $50,000 as your funding target. Then, indicate what you'd do with the $500,000.
We also require that your minimum goal be enough to give your business at least 6 months of runway.