NMI

NMI is a global embedded payments enablement platform providing full-stack payment technology with REST APIs for payment processing, tokenization, recurring billing, customer vault management, and payment facilitation across ecommerce, in-person, mobile, and unattended acquisition channels. With over 20 years of operation, NMI connects 1.2 million active merchants, 6,000 channel partners, and 150+ processor connections, processing over $502 billion in annual payments volume.

APIs

• Payment API - Core transaction processing for authorization, sale, capture, refund, void, and credit operations across card-present, ecommerce, Apple Pay, and Google Pay
• Customer Vault API - PCI Level 1 compliant tokenized storage and management of customer payment credentials
• Recurring Billing API - Subscription plan management, enrollment, and automated payment scheduling
• Query API - Transaction data retrieval and reporting with customizable query parameters
• Merchant Onboarding API - Programmatic merchant application, risk review, and provisioning for payment facilitators
• Webhooks API - Event-driven notifications for transactions, settlements, chargebacks, and billing events
• Three Step Redirect API - Reduced PCI scope payment processing via server-side redirect
• Customer-Present Cloud API - Browser-based POS and cloud-connected payment device management

Developer Resources

• Developer Portal
• API Reference
• Integration Portal
• SDKs and APIs
• Developer Experience
• Support
• Blog
• Contact

Repository Contents

• apis.yml - APIs.json 0.19 provider profile
• plans/plans.yml - Service plans and feature tiers
• rate-limits/rate-limits.yml - Rate limit documentation
• finops/finops.yml - Cost drivers and FinOps guidance