NMI

NMI Transactions API

Core payment processing operations including credit card, ACH, and cash transactions

GitHub OpenAPI

Operations 2

POST /transact.php Transaction Processing #
POST /v4/transactions/reports Get Transaction Data #

Documentation

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

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/openapi/nmi-transactions-api-openapi.yml

Schemas & Data

📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-conversation-amount-input-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-conversation-expiration-date-input-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-conversation-instructions-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-nmi-record-id-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-conversation-id-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-conversation-customer-phone-with-dashes-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-response-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-credit-card-payment-in-full-partial-request-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-credit-card-sale-request-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-achcredit-request-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-achsale-request-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-credit-card-capture-request-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-package-fields-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-application-document-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-package-collection-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-full-application-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-subscription-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/json-schema/nmi-pagination-schema.json

Other Resources

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

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/nmi:nmi-transactions-api"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

nmi-transactions-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Nmi Transactions API
  version: 1.0.0
  x-logo:
    url: https://www.nmi.com/app/themes/nmi/images/NMI_Logo_Primary.webp
  description: 'Operations tagged Transactions across 2 of this provider''s published API definitions: nmi-payments-openapi.yml, nmi-payments-api-openapi.yml. Each path carries the servers of the definition it was published in.'
servers:
- url: https://sandbox.nmi.com/api
security: []
tags:


# --- truncated at 32 KB (111 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/nmi/refs/heads/main/openapi/nmi-transactions-api-openapi.yml