Merchant Maverick’s ratings are editorial in nature, and are not aggregated from user reviews. Each staff reviewer at Merchant Maverick is a subject matter expert with experience researching, testing, and evaluating small business software and services. The rating of this company or service is based on the author’s expert opinion and analysis of the product, and assessed and seconded by another subject matter expert on staff before publication. Merchant Maverick’s ratings are not influenced by affiliate partnerships., Top credit card processing companies for small businesses include Square, Helcim, PayPal, Stripe, Payment Depot and Shopify., Credit card processors are a critical component in processing transactions, whether online, in-store or over the phone. With so many to choose from—and with varying fees, pricing structures .