Compare NMI Payments vs. Opayo

NMI Payments gives developers, SaaS builders, ISVs and ISOs a simple path to embedded payments. As a full-stack processor, acquirer, and technology partner, NMI enables you to integrate, brand, and manage payment acceptance within your platform—without becoming a PayFac or building complex infrastructure. The platform combines flexibility, scalability, and speed, offering white-labeled payments infrastructure that keeps your brand front and center. With omnichannel support for in-store, online, in-app, and unattended payments, you can deliver a consistent merchant experience across every touchpoint. NMI also manages onboarding, compliance, and risk, freeing your team to focus on innovation and customer growth. Developer-First Experience NMI’s developer-first environment puts full control in your hands. Build, test, and launch payments in a modern sandbox with clear documentation and ready-to-use code snippets. Guided onboarding flows and API recipes simplify integration, while low-code and no-code tools accelerate deployment. Business users can evaluate monetization options with instant revenue calculators and self-service sign-up. Whether you’re embedding payments for the first time or scaling across channels, NMI helps you go live faster, stay compliant, and grow with confidence

Opayo, formerly known as Sage Pay, stands out as one of the most reliable payment providers in the UK, dedicated to supporting businesses in expanding their operations and facilitating transactions with customers. Our primary focus is on ensuring payment security and minimizing fraud, allowing you to have peace of mind knowing your customers' information is protected. We pride ourselves on delivering exceptional service, available around the clock, which has earned us a 5-star rating on Trust Pilot. Our payment solutions are designed to grow alongside your business, whether you need to accept Chip & PIN payments in-store or utilize our diverse selection of standalone and integrated terminals. Additionally, you can securely manage mail orders and phone payments through our user-friendly web-based virtual terminal interface. With our omnichannel solutions, customers can conveniently pay in-store, online, via phone, or on mobile devices. While the process of launching a new business or changing payment providers can seem overwhelming, our knowledgeable team of payment experts is ready to assist you at every stage, ensuring a smooth transition and continued success. We are committed to empowering your business with the tools and support necessary for long-term growth.