NMI Gateway

NMI Gateway is a white-label, omnichannel payment platform designed specifically for software providers, independent sales organizations (ISOs), and financial institutions that need to deliver robust, customizable payment acceptance to their merchant clients. Rather than serving merchants directly, NMI operates as a behind-the-scenes infrastructure layer powering more than 4,000 partners who collectively serve over one million merchants worldwide, processing upwards of 5.8 billion transactions and $440 billion in payment volume annually. The platform supports the full spectrum of commerce channels — including e-commerce, in-store, mobile, and unattended environments — and connects to more than 150 processors and acquirers, giving partners the flexibility to route transactions and avoid vendor lock-in. Partners can fully white-label the gateway with their own branding, build custom onboarding flows, and manage multiple merchant accounts or business units through a centralized admin interface, making it particularly well-suited for payment consultants, agents, and fintech companies that need to scale their merchant portfolios efficiently. Key integrations with platforms like Shopify, WooCommerce, QuickBooks, and Xero extend its utility across retail and accounting workflows, while built-in tools for tokenization, fraud prevention via Kount, and EMV/contactless terminal support ensure security and compliance at scale. NMI Gateway is best suited for small to mid-sized payment industry businesses and financial services firms looking for a flexible, processor-agnostic gateway they can brand and deploy across diverse merchant verticals without building infrastructure from scratch.