Are you a business owner looking for a way to earn rewards on your spending? Team Clark assesses the best small business credit cards!Interest rate increases are more likely. Clark says that business credit cards see APR numbers increase at a faster pace than consumer cards. Have you seen signs that say "we're cashless," or "cash only" when you're out? A card must be presented to complete a transaction, either through card swipe on a credit card reader or a manual imprint. If I apply for a business credit card to obtain a bonus they are offering, what purchases qualify as business purchases? Nearly all business purchases can be made with a P-card, but some vendors do not accept credit cards. How to Pay a Clarke Invoice Online. Clarke customers who receive an invoice from Clarke have the option to provide payment online via eCheck or credit card.