Opinions expressed by Entrepreneur contributors are their own. Whether you have a good year or miss your revenue goals, all entrepreneurs and small business owners want to boost their bottom line. One simple way to do this is by changing the payment method you use for business expenditures. Choosing a credit card that earns rewards is essential for scaling startups and small businesses. Selecting a card with cashback rewards can add to your bottom line as you invest in your company. It is literally a way you can “spend money to make money.” Related: How Entrepreneurs Can Scale And Save Money Without Startup Capital How cash-back cards can help your…