NMI

NMI Payment API

The core NMI Payment API (Direct Post) enables transaction processing across card-present, ecommerce, mobile, and alternative payment methods including Apple Pay and Google Pay. Supports authorization, sale, capture, refund, void, credit, and validation operations with credential-on-file and partial payment support.

GitHub OpenAPI

Documentation

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Documentation
https://docs.nmi.com/docs

Specifications

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OpenAPI
https://docs.nmi.com/reference/getting-started

Other Resources

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Sandbox
https://docs.nmi.com/docs/sandbox-testing

OpenAPI Specification

getting-started Raw ↑