Beyond the REST API, there are several flexible paths to choose from: Forte.js for client-side tokenization, Forte Checkout for an embeddable overlay, Secure Web Pay for hosted forms, a React Native SDK for mobile, and batch file processing. Most merchants can go live within 24 hours using the low-code options — no dedicated developer required to get started.

There's no need to switch. CSG Payments’ platform is completely modular, meaning validation, authentication, fraud monitoring, and other capabilities can be layered onto an existing payment processor as standalone services. Internal documentation confirms the platform "integrates with existing CIS, ERP, and billing systems through standard APIs and flexible file-based integrations" — no rip-and-replace required.

The REST API connects directly to Dex, the payments operations platform, giving teams real-time transaction reporting, funding and settlement visibility, dispute lifecycle management, and exportable custom reports. Dex also supports role-based permissions, custom notifications, and developer tools like webhooks and API credentials — all included at no additional cost with payment services.

The API layer includes tokenization, PCI-compliant encryption, ACH account validation (Validate, Validate+, and Authenticate), and access to Payments Protection.ai — an AI-powered fraud detection solution that has reduced fraud losses by up to 70% for clients. It monitors ACH and card transactions across online, phone, and in-person channels, covering threats like account takeover, card testing, and synthetic identity fraud.

The platform is built on cloud infrastructure designed to handle seasonal peaks and long-term volume growth. It has earned TSG's "Best of Breed API Set" award for multiple years and has been recognized for best gateway uptime and lowest minute outage in North America. The platform operates at 99.999% system uptime, making it one of the most reliable in the industry.