Business Partners Customers First TSYS Merchant Solutions , a customer-driven market-focused payment processer with 50 years experience that develops propietary products and services that enable merchants to focus on their core business, while processing payments in the most cost-effective fashion. In addition, ACA Affiliates work directly with TSYS Merchant Solutions to provide the best quality and program pricing available for payment processing. ACA Affiliate members and customers benefit from this cooperative program that assures business clients they're receiving the best possible service, attention and payment processing solutions that TSYS Merchant Solutions provides.